It is one of HiTech's future projects to add a first-person shooter aspect to the game. Instead of dropping non-player troops as they do now, a C-47 will drop a spawn point for the assaulting side. Players will spawn as troopers (with various weapons available to them), and attempt to capture an underground bunker complex on the base. The defending side will of course be able to spawn inside the complex (probably from a "barracks" room, though that's speculation on my part) to defend it in close-quarter combat.
The above plan was revealed by HiTech quite a bit before there was any mention (to the community, at least) about "Tour of Duty", but ToD took precedence over the FPS in the development cycle. At the very least, I would like to see in the interim the ability to spawn as a trooper from the barracks with a choice of weapons. But I don't see it happening.