What is the movie called where there is a plane full of american soldiers that are going to iraq but land in mexico and think it iraq?

That would be Delta Farce (http://www.imdb.com/title/tt0800003/).

If you like Movies in Mexico, I suggest "Once upon a time in Mexico" with Johnny Depp.
Here's a clip of Agent Sands after blinded, in a shootout:
http://www.metacafe.com/watch/yt-NvRkmjRhT8s/blind_johnny_depp/