81-mm Mortar Emplacement

Diagram of a typical 81-mm Mortar Emplacement from the field manual FM 5-15: Field Fortifications, Corps of Engineers, U.S. War Department, February 1944.

81 mm Mortar Emplacement

60mm Mortar Practice Shell

Illustration of 60-mm mortar practice shell from the U.S. WW2 technical manual: TM 9-1901: Artillery Ammunition, War Department Technical Manual, June 1944:

60mm Mortar Blue Practice Shell WW2 U.S.

81. SHELL, PRACTICE, M50A2, W /FUZE, P.D., M52, 60-MM MORTARS, M1 and M2, COMPLETE ROUND (fig. 59), is a practice round provided for the 60-mm mortars by adapting service items for this purpose. Components of the M50A2 Practice Round are the same as are used in the M49A2 Service Round except for the high-explosive shell filler. The M50A2 Projectile has a filler of inert material (plaster of paris and stearic acid) and a black powder pellet (0.05 lb) loaded adjacent to the booster of the M52 Fuze. The M52 Fuze is a superquick fuze and shell is functioned before penetration occurs. The black powder pellet and booster charge provide a spotting charge for observation purposes. The shell is loaded to the same weight as the service round, thereby providing for the same ballistic values.


   With M52
or M52B2 Fuze
  With M52B1
(Plastic) Fuze
Weight of complete round       2.96 lb    2.80 lb
Length of complete round     9.54 in.  9.54 in.
Muzzle velocity     518 ft per sec*  535 ft per sec*
Maximum range (at 45 deg)     1.984 yd*  2,017 yd*
*–For charge 4 (cartridge plus 4 increments).

Nothing’ll Stop the Army Air Corps

Nothing'll Stop the Army Air Corps

Battery of the Battleship USS California

The shining 14-inch 50-caliber main guns, “sentinels of security,” form the forward main battery of the USS California (BB-44). The USS California was sunk on Battleship Row in the Japanese attack on Pearl Harbor in 1941, but the ship was salvaged and reconstructed to serve in the Pacific for the remainder of WWII.

Main Battery of the Battleship USS California

Source: Bureau of Naval Personnel Information Bulletin, November 1942.