CFS2 always had something missing in the fact that AI helicopters were absent....even though choppers were rare in WWII.  But Doug Attrell, AKA Grumpy, AKA Hagar, created the highly successful little S-51 for the Fox Four Korean campaigns. 

Since then a number of AI choppers have been created and are available for download on the Fox Four Extras page:

http://www.simviation.com/lair/cfs2kwextras.htm

There are additional AI choppers available (but lost and misplaced) on page 18 in the old CFS2 Scenery section:

http://www.simviation.com/cfs2scenery18.htm

Give them a try in MB....you'll like 'em.  I guarantee it. 

And a few more...