I think that the M42 may have been 'loaned' to the Corps, during times of deployment. However, I agree with your statement. I have not found any information which would stand to your strong position. It appears that the USMC depended more on its AA batteries and, most important, the use of Redeye/Stinger missiles. Because of the mobility of the Marines, the individual teams of infantry SAMs were the cheif deterant of AA. And the use of Naval Carrier Air Superiority. Very interesting. Which seems to be backed by its present day inventory of air deterance:
2000 Stingers/infantry
250 deployable Avengers
17 LAV-AD
Unsure of 20mm Vulcan AA.
Neat stuff
