I need some tips for playing on hard. I only have a few levels left but I am struggling a lot with them. Any help would be awesome.

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Well...if you're just trying to complete the game on hard and aren't worried about kills or score...

I'd say the best thing to do is stay well behind your fellow soldiers and let them do as much of the work as possible. They will kill the majority of the enemies. You will only be forced to kill a few guys to advance the level.

Also, you can also shoot at enemies, but won't get shot at much if you stay back.

Hope that helps a little. 

Ok thanks that helped but I need a lot of help for the battle at Selma. Any tips for that one?

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Save the game as much as you can, ewverytime you do a perfect move, like killing some soldiers without taking damage, save the game. And reload from last save when you are not doing good. It makes the gameplay slow, but if you are stuck...