This item was donated by Pte Edwin Stanley Tricker (3797633) who was a National Serviceman with the Royal Australian Infantry Corps. He served in Vietnam with 1 Australian Reinforcement Unit from May 1970 to June 1970 and Headquarters, 1st Australian Task Force from June 1970 to August 1971. Originally called CH-47A by the manufacturers Boeing and the US Army, these Chinook helicopters were similar to the cargo version except for some beefing up of the airframe to sustain the vibration of weapons when firing. There were also flown at a higher rotor RPM. This Chinook has the 40mm cannon and rocket pods which carried the 2.75 inch folding rockets. These were hard mounted and aimed by the attitude of the aircraft. Two of the 4 pintal mounted 40 calibre machine guns can be seen in the picture. It has been reported that one was also mounted on the ramp. Only four of these chinooks were built and sadly only one survived the war in Vietnam. Later called the ACH-47A (Armed Caro Helicopter) by the US Army.Framed coloured photograph of two CH471 helicopters. One helicopter is parked on the ground. The other one is airborne. Description of the CH47A is written below the photo.U.S. Army logo, Army. tail number "US Army 413145". B.117.ch47a, chinook, united states army, helicopter - chinook, pte edwin stanley tricker, 3797633, australian national serviceman, royal australian infantry corps, 1 australian reinforcement unit, headquarters, 1st australian task force