Final answer:
The training projectile in question contains a small smoke canister instead of an explosive charge, providing visual confirmation of its functioning during military drills.
Step-by-step explanation:
The projectile used in place of the M107 HE projectile in training exercises is designed to approximate the behavior of the live munition while providing a visual cue for the determination of functioning.
This projectile contains a small smoke canister in the fuze well, which produces a visual signal through flash and smoke.
This visual representation is crucial for training purposes, allowing soldiers to visibly confirm if their projectile has functioned as intended without the use of a live explosive, thus ensuring safety and cost-effectiveness during training exercises.