US Army, Technical Manual, TM 5-4320-222-25P, PUMP, RECIPROCATING: DIAPHRAGM, G DRIVEN, WHEEL MOUNTED, RUBBER TIRES; 4-INCH, 100 GPM AT 10 FT S LIFT, (RICE PUMP AND MACHINE CO., MODEL 4D-327), SERIAL NO. RANGE THRU 1245, LESS MIL STD ENGINE, (FSN 4320-829-8434), military manauals, special forces