What is the highest level you got in call of duty 4?

Mine is normal.

I finished the entire game on hardcore and I finished some of  the easier levels on Veteran...the one level I absolutely cannot do is the Mile high club on Veteran..that level is like impossible

Normal. I was too lazy to go back and do it again on another difficulty.

Narmoal

"Normal. I was too lazy to go back and do it again on another difficulty."

Veteran and normal.

Normal

Had to look it up: 

Deep and Hard Complete the game on Hardened or Veteran difficulty

90  Acquired 3/15/2008

Beat it once on Hardened.

I did it on normal, I don't really care to do games over on insane difficulties

Normal. I'm a bit more than 1/2 way through veteran but haven't had the will power for about 5 months to get back to finishing it.

haven't even finished it on Normal.