Visible crew/equipment: At the tuxedo shop, after Tim's phone conversation with Delilah, when Ellie says, "I guess that's that, hey decision made," in the next shot facing Tim (he's standing in front of a trifold mirror), the reflection of the boom mic is visible at the top, right corner of the screen. (00:01:55)
Visible crew/equipment: After Gibbs leaves McGee at the hospital, when it cuts to the bar with Palumbo at the pool table, there are multiple yellow and orange T-marks on the floor by the bar behind him. (00:27:15)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.