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[MrFlibble]

Huh? These screenshots in the post you quoted are from several games, and for each, the game title is shown on the left above the image.

[Klangfarben]

I would say Crusader: No Remorse. You play as a red Soldier (?) and you need Keycards.

[MrFlibble]

Originally Posted by Dellop

You controlled This Green little soldier-looking man, shooting your way through levels of enemies, which I remember as red soldiers(and not sure, but robots, tanks and choppers to) dropping ammo or an equipable weapon as you shot them.

Hmm, I wonder if it could be this game: Bert Higgins: The Man From H.E.L.L.? Judging by the screenshots, the game has both outdoor and indoor environments.

Here's a review with some more shots and info.