I believe the correct term for this would be "its on".
www.debka.com
(visit the link for the full news article)
DEBKAfile’s military sources report that Saturday, May 17, the USS Mount Whitney , considered the US Navy’s most advanced command, control, communications, computer and intelligence vessel, took up position opposite Lebanese shores for an “unscheduled mission.”(visit the link for the full news article)
The Sixth Fleet spokesman Lt. Patrick Foughty said the ship would be there “to support additional communication requirements for our ships already underway.”