Amphibious Armor Cargo Carrier M733.
The relationship of the M733 to the M116 Husky can be gleaned from the running gear and overall shape. Light steel armor was attached to the hull of the M116, leaving an open-topped passenger compartment. The driver was given a viewport to the direct front, and three machine gun pintles were added, one at the front and one on each side. Two M60D machine guns are present on this machine. (Picture from FMFM 9-2 Amphibious Vehicles.)
This vehicle has a .50cal machine gun M2HB in a ring mount behind the engine, and a 40mm automatic grenade launcher XM174 points skyward on the front pintle. The armor slopes downward toward the rear of the vehicle. An M116 Husky is in the background; note that its track shrouds are not attached. These vehicles belonged to the 11th Motor Transport Battalion of the 1st Marine Division. (Picture taken 23 January 1970 by Cpl R.D. Bell; available from the National Archives.)
A marine mans the grenade launcher. An M60 machine gun is present at the right rear corner of the carrier, but the .50cal machine gun has been removed. (Picture taken 23 January 1970 by Cpl R.D. Bell; available from the National Archives.)
The grenade launcher has replaced the machine gun at the right rear corner of the vehicle. (Picture taken 23 January 1970 by Cpl R.D. Bell; available from the National Archives.)
This front view shows the driver's position and viewport and the sprocket teeth engaging the center of the tracks. The armament now consists of two M60s, the XM174, and the M2HB. (Picture taken 23 January 1970 by Cpl R.D. Bell; available from the National Archives.)
The same configuration is seen from the left side. The fuel filler was given an armored flap, and the track shrouds with the slotted forward half were carried over from the unarmored version of the vehicle. (Picture taken 23 January 1970 by Cpl R.D. Bell; available from the National Archives.)
The XM174 has been secured to the ring mount. The driver's steering wheel is visible at the front left corner of the carrier, and the screened-in engine separates the cab area from the passenger compartment. The engine muffler exits the round hole near the center of the vehicle, and the fuel tank vent is under the square opening further back. (Picture taken 23 January 1970 by Cpl R.D. Bell; available from the National Archives.)
An 81mm mortar has been mounted in the passenger compartment of this vehicle. The tailgate-like rear cargo door has been lowered, revealing some stowage inside. The driver is at his position at the front left. The vehicle was organic to the 11th Motor Transport Battalion, but the personnel were from 2/1 Marines and were near Marble Mountain, 4 miles southeast of Da Nang. (Picture taken 29 March 1970 by Sgt G.J. Vojack; available from the National Archives.)
The same vehicle is performing a fire mission. A five-gallon (19L) fuel can could be stowed on each side of the cargo door. (Picture taken 29 March 1970 by Sgt G.J. Vojack; available from the National Archives.)
The interior of the passenger compartment including the mortar mount are revealed in this image. (Picture taken 29 March 1970 by Sgt G.J. Vojack; available from the National Archives.)
