I noticed that, too. By the way, I’ll take that snappy new Nash.
Hap Arnold was looking for a way to provide heavy maintenance close to the fight in the very mobile Pacific war. They hit on the idea of a floating factory. Six Liberty Ships were fitted out (the "Generals") with all manner of shops, from machine shops, to oxygen refills, to carburetors, etc. Each ship had two or three helicopters and two DUKW's to ferry people and parts. The Generals could handle B-29's and P-51's, while the smaller ships (the "Colonels") handled fighters. They were also heavily armed with AA weapons.
The crews were a curious mix of Air Force mechanics and Army sailors, drawn from the Merchant Marine.
I found a very interesting unit history of the MG Dargue (2nd Aircraft Repair Unit - Floating).
http://www.cbi-history.com/documents/2nd_aru_history.pdf