Thanks for the replies.
My goal is to create a lite-form rpg using the starship troopers rules rather than the RPG version. As the GM I would play the bugs in battles etc, but the aim is not to have a series of balanced battles, as per normal rules, but rather run through a campaign made up of a series of scenarios - just like the Pluto campaign in the RPG version.
At the moment I think that each player will have be a squad leader rather than an NCO or officer (these will be controlled in battle by the players, but as GM I can veto their orders and replace them with my own, if the story needs it!). The longer each character survives the more hero traits they can buy for themselves. On top of this would be the chance of being promoted to NCO or Lieutenant.
To allow a little more scope for RPG type combat orders I am thinking of making the following changes:
1. A model can go out of command range and still get 1 action per turn. Any unit to qualify must have been given specific orders, rather than just going out of command range due to flinching. Such order could be fairly general e.g. go kill the plasma bug or as specific as make sense.
2. A cpl would have a reduced command range, but gains it from the begining, rather then when promoted to squad leader on death of previous one.
Basically, I want to have a platoon size military RPG, that is quick and easy to play, yet still allowing characters to get better.
Any suggestions greatly appreciated.