Continuity mistake: When Gibbs and McGee go to Captain Vetter's home, Gibbs holds up his ID with his left hand in the shot facing Vetter, but the ID is held up in his right hand in the next shot facing Gibbs. (00:17:45)
Continuity mistake: Gibbs puts his gun in his drawer on a blue folder then goes to talk to Fornell in the lift. When he comes back, he picks his gun up and the contents of the drawer and position of the gun have completely changed. (00:14:50 - 00:16:50)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.