ACH-47A Chinook &quot;Easy Money&quot; outside the US Army Program Executive Office (PEO) for Aviation. AHS photo taken at Redstone Arsenal, Huntsville, Alabama, Feb. 20, 2018. The aircraft was one of four operated by the Guns-A-Go-Go unit in Vietnam, 1966-68. They were originally designed the Armed/Armored CH-47A or A/ACH-47A.