FPS ideas

heyhey ppls!!!
any1 got any ideas for any other gud free fps games i can try?
i prefer 1st person (durrr its fps) realistic military fps games over those futuristic/scifi weps n games
if its gud enuf ill play 3rd person or diff time/genre of shooting games

the fps ive played so far r:
-TF2 (dont prefer to play these types of games wit unrealistic movements n items)
-Combat Arms (now a lot of hackers)
-Alliance of Valiant Arms (still play it n still luv it)
-Cross Fire (still in it n luv it)

btw this is to train myself, find new tricks, n train members since i started a team in our school
im pretty gud at sniping, range fights, melee, n close range (i can be an all around player if i need to)
but i prefer sniping, n fast running classes over any other plays n classes if this helps giv ideas