Helming the hospital is Colonel Xavier Marks (Elias Koteas) of the Canadian Forces, a career military surgeon and Head of the Role 3 Multinational Medical Unit. New Role 3 recruits include Major Rebecca Gordon (Michelle Borth), a top-of-her-class trauma surgeon who’s eager to impress, and Trauma Team Leader Captain Bobby Trang (Terry Chen), a general practice doctor and a gentle soul who’s a bit less confident in his abilities than Rebecca. The only non-military medical staffer is brilliant British neurosurgeon Dr. Simon Hill (Luke Mably). The others can’t figure out why he volunteered to work in a war zone. Australian psychiatrist Major Grace Pederson (Deborah Kara Unger) oversees the mental well-being of the troops. The Chief of Nursing is Commander Will Royal (Arnold Pinnock), a registered nurse serving with the Canadian Forces who keeps everything running as smoothly as possible and won’t let his co-workers forget it.