Lieutenant

Lieutenant is a rank, used in many military, paramilitary, and civilian contexts:
 * In many military organizations, including the United States Army and Air Force, lieutenant is a junior commissioned officer rank below a captain.
 * In law enforcement and some federal agencies, a lieutenant is a superior rank, that can supervise one or several shifts.
 * In organized crime, paramilitary, and terrorist organizations, lieutenant is an informal title given to the seconds and thirds-in-command.

Military

 * Tony Almeida – United States Marine Corps
 * Southern – United States Navy, ranking officer aboard the Natalia
 * Chris Tanner – United States Air Force, drone pilot
 * Peter Dennon – United States Air Force, drone pilot
 * Ben Wilkins – Royal Air Force

CTU field operations

 * Jim Wong

Police

 * Bryce Hardin – Colorado Police Department