I'm looking for an old game (from the late 90s I think) which was some sort of mixture between decsent and jungle strike in the way that you played in a spaceship that flies around looking for soldiers on the ground and then turn Into a land veihcle and pick them up
While doing it you also had to take care of your fuel so you had to use the soldiers you rescued to go and pick the fuel tanks from the ground
Last thing I remember about the game is when you want to move on to the next level you fly into a spiral gate and it takes you to another zone