EH after some research, I have discovered that the M163 Vulcan VADS has been replaced... a long time ago. Unfortunately, BIS forgot the read the memo, or wanted to be lazy. Although the system was relatively good, it was decided to replace it with fast and agile missiles instead (RAMs).
Currently, from what I have found, the US Military uses the HMMWV Avenger (2 FM-92 Stinger Launchers) and the M6 Linebacker (M2 Bradly with 4 FM-92 Stinger Launchers). As far as ground defenses we have the upgraded (thank god) patriot missile system. The most mobile AA weapons is the FM-92 Stinger. And actually, the Avenger is what replaced the M163 and M167 VADS.
So in reality the only application Mando Gun is realistic to be used with is on board a carrier, or in conjunction with non-US based air defense systems.