
Used by artillery observers to signal or lay in a line of fire.
The external appearance is similar to ground signals M17A1 series, and the internal description is similar to aircraft smoke signals of the T43 - T47 series. T38 to T42 inclusive will produce red, orange, yellow, green, and violet smoke.
Signal, Aircraft, Smoke, T43, T44, T45, T46, T47
Signal, Ground, Parachute, M17, M18, M19, M20, M21, M22
USNBD - Bombs and Fuzes, Pyrotechnics (1945)