Now I need help

If anyone out there has beaten the ODST Firefight acheivement for beating a firefight mission on hard for over 4 sets, and if you did it on Lost Platoon, I need some tips to do it. My friends and I tried it about 5 times and we got to the 4th set, 3rd round, and 3 enemies left against 1 guy (who was an idiot, no offense). WE LOST!!!!!! Well anyway, if you have any tips about how to beat it on any map (preferably on Lost Platoon) post a comment on this post and I will look at it.

Call of Duty Modern Warfare 2 help

Are you having trouble beating a few levels on veteren? All you have to do is find a good sniping place when you have a few other guys helping you like Ghost or McTavish (AKA:Soap). They will take care of most of your enemies but there might be a lot so take some out in your special hiding place. Also, if you are looking for any enemy intel that you just cant find, I found a YouTube video by Rooster Teeth (who have a lot of video game videos that are awesome and helpful). Here is the link to the video (which is just the first part of the first act. You will have to look at the videos on the side and find the later ones).

http://www.youtube.com/watch?v=jUmaVEN8UDo

If anyone has any tips about how to beat the levels in the later Act II missions and the Act III missions, put a comment on this post and I will check it out.

Also, I found a site that shows how to get all of the emblems and titles. This is it:

http://emotionalninja.net/2009/11/15/modern-warfare-2-how-to-get-titles-and-emblems/