[PAR35]

“What the hell is an “offshore support vessel”?”

Probably one of these:

https://en.wikipedia.org/wiki/RiverHawk_OSV_60

200 feet long, well deck with two fast attack boats; armed with a 30mm main gun and an assortment of machine guns. Crew of 26 with 40 passengers.

[RitchieAprile]

The ship in question: USNS Eagleview (T-AGSE-3)