At the game's beginning, you'll notice that in Stroggos' bases are plenty of similar devices to the ones, showed on the screenshot above. This are medical positions, which operates identically how the ones from Doom 3 or the Half-Life series. The player can use them after turning into Strogg (after Strogg Medical Facilities level). Every station has the specific number of health points and you can't use it ad infinitum. The 'depleted' message will inform you about station's useless.
You'll find medics and engineers, among other allied soldiers in Quake 4. The medics will recover your health points and the engineers will take care of armor. If you need help, click on the specialist (if the surroundings are cleared from enemies of course). If these gentlemen aren't important for the game's task, the opponent can kill them. During the play on higher difficulty levels, protect the medics and engineers as long as you can.
Look into the chest, carefully explore every room. Health and ammunition are often hided in hard to reach places or in the shadow (use Flashlight).
The game is linear. There aren't any optional patches to finish given level. Despite that, look for green light on the door. Behind them you'll most often find useful items that will help you in game (health, armor, ammunition).
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