Medal of Honor Allied Assault was the first FPS that I truly tried to play (Doom and Wolf I've played but pseudo 3D). Played the demo on my Oooooold 333 MHz Celeron with 128 MB SD RAM. Played the Full version much later on my first gaming capable machine. It was awesome (Normandy Landing), still play it occasionally when I feel like it.
Medal of Honor Airborne is truly a different class. It was wonderful to play with the variety of weapons and the mods for the weapons, etc.
The last one is a COD MW clone and not a true member of the MOH series.