The Army Mule that Fights Like an Eagle

By Bryant D. Macfarlane

Article published on: September 1, 2025 in the Army History Fall 2025 Edition

Read Time: < 6 mins

Boeing artist’s representation of the armament installation for the aircraft. The crew of “Easy Money” would add two M60D machine guns to the cargo hatch to keep the vulnerable underbelly of the aircraft covered during low passes. This graphic appeared in “Armed/Armored CH–47a (A/ACH–47A) Flight Test Report,” November 1965. U.S. Army Aviation Museum

Boeing artist’s representation of the armament installation for the aircraft. The crew of “Easy Money” would add two M60D machine guns to the cargo hatch to keep the vulnerable underbelly of the aircraft covered during low passes. This graphic appeared in “Armed/Armored CH–47a (A/ACH–47A) Flight Test Report,” November 1965. U.S. Army Aviation Museum

Thunder Over Trang Bang

On 19 July 1966, near Trang Bang, South Vietnam, the soldiers of Company A, 1st Battalion, 27th Infantry “Wolfhounds,” found themselves pinned down in an ambush. With enemy fire raking their position and the jungle canopy complicating support, the situation was dire. Then, a distinct, deep thumping sound cut through the chaos—not the high whine of a Huey, but the heavy rhythm of
a Chinook.

However, this was no cargo run. The ACH–47A “Guns A Go-Go” gunship dipped its nose, but instead of dropping supplies it unleashed a massive barrage. The nose-mounted 40-mm. grenade launcher began to thump, flanked by the roar of 20-mm. cannons and the chatter of five .50-caliber machine guns. As it circled, the “Go-Go Bird” created a “ring of steel” around the Wolfhounds that decimated the enemy position and allowed the infantry
to maneuver.

For the soldiers of Company A, the effect was immediate. Unlike standard gunships that had to dive and break, the ACH–47A maintained a continuous circuit and provided unbroken suppression. The enemy withered under the relentless fire. The engagement proved that the platform validated the Chinook’s capability. A ground commander’s assessment was recorded officially in the Army’s final evaluation of the program: the ACH–47A was “the best thing to happen to the infantry since the squad radio.” 1

A Bold Experiment

The ACH–47A “Guns A Go-Go” program, a bold Vietnam-era experiment, holds significant historical impact not just for its formidable combat record but also for the critical lessons it provided on military strategy, innovation, and procurement. Although short-lived, the saga of these four heavily armed CH–47 Chinook helicopters illuminates key historical themes: the evolution of airmobile warfare, the brutal realities of combat-driven innovation, and the persistent interservice rivalry that shaped military doctrine for decades.

A Powerful, Yet Imperfect, Solution

Born from the U.S. Army’s need for more sustained firepower than the lighter UH–1 Iroquois helicopters could provide, ACH–47As (nicknamed “Go-Go Birds”) were an impressive feat of engineering. The Chinook’s stable tandem-rotor design and substantial cargo capacity made it an ideal candidate for a gunship conversion. Armed with a 40-mm. grenade launcher, 20-mm. cannons, and multiple machine guns, the Chinook was a flying fortress. Its 360-degree field of fire was a unique advantage, and it could loiter longer and carry more ammunition than any other helicopter gunship of its time.

This experimental platform, with its impressive firepower, demonstrated the immense psychological and physical impact of concentrated aerial fire on the battlefield. Ground troops consistently praised the four Go-Go Birds (named “Easy Money,” “Stump Jumper,” “Birth Control,” and “Co$t of Living”), noting the enemy’s rapid retreat whenever they appeared. The heroic actions of Easy Money during the Battle of Hue—rescuing the crew of the downed Birth Control under heavy fire—stand as a testament to the ACH–47As effectiveness and the courage of its crews. The ability to deliver sustained, omnidirectional suppressive fire proved decisive in the dense, urban environment of Hue, where fixed-wing support was often less precise.

The first two converted gunships 64-13145 (B–117) “Co$t of Living” (front) and 64-13149 (B–121) “Easy Money” (rear) are seen here outside the Boeing Center Two facilities at the Philadelphia International Airport in Pennsylvania during the Army’s acceptance of the aircraft, ca. December 1965. Their crews would soon wipe away the bright roundel, gloss exterior, and bright yellow markings.

The first two converted gunships 64-13145 (B–117) “Co$t of Living” (front) and 64-13149 (B–121) “Easy Money” (rear) are seen here outside the Boeing Center Two facilities at the Philadelphia International Airport in Pennsylvania during the Army’s acceptance of the aircraft, ca. December 1965. Their crews would soon wipe away the bright roundel, gloss exterior, and bright yellow markings.

Enduring Lessons from a Short Life

Despite its combat success, the ACH–47A program faced a series of challenges that ultimately led to its demise, providing invaluable lessons that resonate with modern military practitioners.

  1. The Perils of Low-Volume, Specialized Platforms: With only four aircraft built, the program was highly vulnerable to attrition. The loss of Stump Jumper in a taxiing mishap and Cost of Living to a catastrophic mechanical failure left only two operational gunships. This limited number made the program logistically difficult to sustain and strategically unviable. For modern military acquisition, these issues highlight the need for a robust industrial base and a clear sustainment plan for any new platform.
  2. The Importance of Rigorous Testing: The tragic loss of Cost of Living and her entire crew underscores the critical importance of comprehensive testing before full-scale deployment. A seemingly minor mechanical issue—a loose mounting pin—had devastating consequences, reminding the Army that even the smallest component can be a point of catastrophic failure under combat conditions.
  3. Balancing Specialization and Versatility: The ACH–47A’s modifications made it a single-purpose asset, ill-equipped for its original transport role. As the war progressed, the U.S. Army had a far greater need for standard CH–47 transport helicopters than for a specialized gunship. This scarcity, combined with the high cost of conversion and sustainment, made the program unsustainable. The Go-Go Bird became a victim of its own specialization, failing to adapt to the broader strategic needs of the war.
ACH–47A “Easy Money” after arrival at Vung Tau Air Base, Vietnam, ca. mid-1966. Note the loss of the glossy stateside paint job, though it is still possible to see portions of the roundel under the rapidly applied matte paint job for its field testing in Vietnam.

ACH–47A “Easy Money” after arrival at Vung Tau Air Base, Vietnam, ca. mid-1966. Note the loss of the glossy stateside paint job, though it is still possible to see portions of the roundel under the rapidly applied matte paint job for its field testing in Vietnam.

A Battle of Turf and Doctrine

Perhaps the most historically impressive aspect of the ACH–47A program was its role in the long-standing interservice dispute between the U.S. Army and the U.S. Air Force over close air support (CAS). Established by policies like the Key West Agreement of 1948, fixed-wing CAS was largely the Air Force’s domain. The Army, however, consistently argued for organic air support, believing its attack helicopters were better suited for close-proximity engagements.

Guns A Go-Go was a direct challenge to this established doctrine. It was a bold, heavy-handed statement from the Army, directly infringing on what the Air Force considered its turf. This bureaucratic conflict reflected divergent philosophies on the nature of warfare. The ACH–47A, despite its battlefield effectiveness, was a mismatch of interservice doctrine, making it politically and bureaucratically difficult to sustain as a long-term program. This historical friction between the services over emerging technologies and capabilities remains a relevant challenge for today’s militaries.

A Standout Piece of Army History

What makes Easy Money a fitting piece for inclusion in the U.S. Army Aviation Museum? Beyond its value for preservation as a rare airframe, it highlights the Army’s “Soldier First” philosophy. For the infantryman on the ground in 1966, this aircraft represented the Aviation branch’s commitment to clearing the way and bringing the infantry home, regardless of the engineering hurdles.

The ACH–47A also is a testament to the Army’s readiness to modify and adapt machinery to meet the needs of a soldier in a battle. As part of the Aviation Museum’s collections, Easy Money is a teaching tool with lessons applicable to soldiers at all levels of professional development. In addition to its meaningful legacy as an example of the ways in which Army Aviation protects troops on the ground, it serves as a reminder to current and future Army leaders that innovation often comes from the bottom up, born of necessity amid chaos in battle.

“Easy Money” as a parts bird at Vung Tau Air Base, Vietnam, shortly after its final flight. Cannibalization and the environment would ravage the aircraft for decades to come before it would be saved.

“Easy Money” as a parts bird at Vung Tau Air Base, Vietnam, shortly after its final flight. Cannibalization and the environment would ravage the aircraft for decades to come before it would be saved.

Restoration and Legacy

Easy Money completed its final combat mission on 2 February 1968, participating in the rescue of the Co$t of Living crew in Hue, Vietnam. Adhering to authorization and doctrine requiring two Go-Go Birds for operations, Easy Money subsequently was disarmed and transferred to the Boeing training facility at Vung Tau. There, it served as a frequently cannibalized donor aircraft until the conclusion of the war.

Following the war, the aircraft was moved to the Savanna Army Depot in Illinois with the intention of contributing to the development of what would become the CH–47D. However, because of significant battle damage, corrosion, and prior cannibalization, Army leaders deemed it unsuitable for this purpose. After being stored at the depot for several years, it was transferred to the U.S. Army Aviation Logistics School at Fort Eustis, Virginia. There, it functioned as a training aircraft for the Sheet Metal Repairer Course until its unique identity was discovered
around 1997.

Upon rediscovery, Easy Money underwent extensive corrosion abatement, exterior restoration, and fabrication. It subsequently was placed on exterior display, with parts sourced as available. In December 2024, Easy Money was transferred to the U.S. Army Aviation Museum at Fort Rucker, Alabama, for a comprehensive restoration and conservation effort. The aircraft is currently in storage, awaiting restoration, and is slated to become a permanent exhibit at the William A. Howell Aviation Training Support Facility upon completion.

“Easy Money” arrives at Fort Rucker, Alabama, fifty-seven years after its final flight. The aircraft will go through restoration and conservation work before joining the collection of aircraft on display at the U.S. Army Aviation Museum.

“Easy Money” arrives at Fort Rucker, Alabama, fifty-seven years after its final flight. The aircraft will go through restoration and conservation work before joining the collection of aircraft on display at the U.S. Army Aviation Museum.

The ACH–47A was a formidable weapon, born of battlefield necessity and a spirit of innovation. Its combat record, particularly the heroic actions of Easy Money, demonstrated the immense value of responsive, sustained close air support. Yet the program’s short life and ultimate cancellation provided invaluable, if painful, lessons. It highlighted the challenges of interservice doctrinal disputes, the logistical and financial burdens of niche platforms, the critical importance of robust testing, and the ever-present tension between specialization and versatility. The story of the Go-Go Birds is a powerful reminder that even the most impressive combat capabilities must be balanced against strategic needs, fiscal realities, and the persistent, evolving challenges of military collaboration.

Notes

1. Rpt, U.S. Army Concept Team in Vietnam, “Final Report, Project No. ACN 44F-I-114: Evaluation of Armed/Armored CH-47A Helicopter,” San Francisco: Headquarters, U.S. Army Vietnam, 16 Nov 1966, 22.

Author

Bryant D. Macfarlane is the curator for the U.S. Army Aviation Museum and William A. Howell Aviation Training Support Facility at Fort Rucker, Alabama. He manages approximately 3,500 artifacts. He retired from the U.S. Army after nearly twenty-three years of distinguished service as an aircraft crewmember. His extensive military background provides him with a deep, firsthand understanding of the aircraft, technology, and personnel that have shaped Army aviation. In addition to his military career, Bryant has taught undergraduate courses at Kansas State University and Bethel College, Kansas, in American history, American military history, and the history of technology.