That one is a USAF door gunner,not Army. Probably on slighly larger aircraft than the Blackhawk, the "other Sikorsky" the HH-53 Pavelow. And that's not even the biggest "gun" it carries. It has 3 mounts, mix and match those Mini-guns (only 7.62 mm/.30 cal) and/or M-2 (.50 cal/~12.5 mm) Two Gatlings are visibile on this little darling, the third mount is on the rear ramp.
