Staff Sgt. Sam McBride, radio call sign Whiplash, joins The Unit in the middle of the fourth season and is put through a nerve-shredding final test of loyalty where he is apparently arrested by the ATF who hold him responsible for the death of a judge during a training exercise. We later learn this is due to him having a reputation among his peers as being something of a loner. He passes the test and takes part in five operations as part of The Unit's Alpha Team with great success, including helping to kill the sniper who shot dead his predecessor.However he appears to develop an obsession with fellow Unit member Bridget Sullivan, which takes a serious turn. It is unclear what Sam McBride's prior military unit was or which decorations he had earned. Little is known about his background, as only one ex-girlfriend has resurfaced and he appears to have a very casual, shallow relationship with her. He uses a Glock 9mm pistol, despite Mack Gerhardt trying to persuade him to switch to a Colt 45. He appears to be very skilled in the art of 'free running,' jumping from object to object without ever touching the ground. He is very resourceful and technically adroit, especially in terms of escape. He is also extremely ruthless when he needs to be. Show less «