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Self-Propelled Gun, 90 MM “Scorpion”

Image by Children of the Concrete
The display reads:
SELF-PROPELLED GUN, 90 MM "SCORPION"
M56
USA, VIETNAM CONFLICT
Designed for airborne operations, the M56 was troop tested with the 82nd and 101st Airborne Divisions in 1953 and was officially adopted in 1957. Conceived as a rapidly deployable anti-tank weapon, it saw service as field artillery in "Operation Toledo" July 1967, during the Vietnam Conflict.
Its 90 mm gun has a vertical sliding breechlock which fired the same ammunition as the M48 Tank. The chassis features high aluminum content with both riveted and welded construction. The only armor on the vehicle is the gun shield. It was replaced in the U.S. Army by the M551 "Sheridan," though it continued in service for some years in the Spanish and Moroccan Armies.
Caliber: 90 mm (3.5 in) (M54)
Weight: 7,035 kg (15,477 lbs)
Range: 3,500 m (3,850 yds)
Shell Weight: 8.2 kg H.E. / 10.9 kg A.P. (18 lbs H.E. / 24 lbs A.P.)
Elevation: 380 mils (15 degrees)
Traverse: 1,080 mils (60 degrees)
Crew: Four
Speed: 45 km / h (28 mph)
Engine: Continental A01-403-5 6 cylinder
Cruising Range: 224 km (140 miles)
Museum Acc.#: 66.40.1
Taken October 1st, 2011.