US Cartridge, 105mm Illuminating, M314, M314A2, M314A2B1
These are howitzer fired base ejection cartridges with a parachute retarded illuminating canister installed. The M314A3 projectile uses the M565, M577, or the M724 fuzes. The M314, M314A1, & M314A2 use the M501 series fuze.
The M314 series projectile could have a gray body with white band and white marking, or a white body with black markings. The caliber, shell designation, lot number, and date of manufacture are stamped into the projectile bodies, just forward of the rotating band.
Collaborative Ordnance Data Repository