Looks like the Navy has coined a new term.
I heard it for the first time a couple of months ago when I was out on the Truman and talking to Rear Adm. Patrick Driscoll, the strike group’s commander. He was explaining how they would remain ready despite a six-month gap between the JTFX and an actual deployment.
Driscoll said the strike group would probably go out for another large-scale excersise.
“The Navy loves acronyms, so we’ll probably call it ‘sustain-ex’ or something like that,” Driscoll said casually.
Looks like that term Driscoll was trying out has been formalized. A few days ago, the Navy public affairs office announced that the carrier John C. Stennis is heading out for a “sustainment excersize (SUSTAINEX).”
Add that to the next edition of the Dictionary of Naval Abreviations, or DICNAVAB.