Command Strike FPS is a mission-based first-person shooter with the standard military toolkit: rifles, grenades, first-aid kits and crouching for accuracy. Maps vary and the objectives are the familiar clear-and-advance shape.
It's a solid browser shooter rather than a remarkable one, and its virtue is completeness — the mechanics you expect are all there and they work.
WASD to move, left click to fire and right click to aim, space to jump, C to crouch, G for grenades, H for a first-aid kit and R to reload.
The core game is mission-based against computer enemies across several maps.
Yes — it runs in the browser with nothing to install; lower the settings on older hardware.