Visible crew/equipment: In the scene where Tony approaches the Mallard residence by car for the first time, there is a stage light, complete with filter(?) on the balcony. (00:13:50)
Visible crew/equipment: While Ducky starts to tell Jimmy about an English earl, when Gibbs walks into Autopsy, the reflection of crew members are visible on the steel door's surface. (00:08:35)
Visible crew/equipment: On the rooftop, after Caitlin leaps in front of Gibbs and takes the bullet in her vest, just as Gibbs and Tony help Caitlin stand up, in this shot the blue crash mat is visible on the ground. (00:41:45)
Bikini Wax - S2-E18
Visible crew/equipment: When Gibbs joins Caitlin on the beach just as she finishes up her call, in the wide shots their two reddish T-marks (plastic type) are visible on the sand, where each of them stand. (00:06:20)
Visible crew/equipment: After Caitlin shrieks and tells Abby that Gibbs is driving, Abby replies that she's saying a prayer in many languages. It then cuts to a shot of the car Tony's driving, and the reflection of the camera comes into view on Tony's window as the filming vehicle pulls alongside. It's visible again in a following shot. (00:37:40)
Forced Entry - S2-E9
Visible crew/equipment: Right after the intro at the start, when Gibbs and Caitlin get out of the vehicle the reflection of the large reflector screen is visible on the door's window. (00:01:40)
Visible crew/equipment: After Gibbs explains to Agent Reyes that Commander Shields in on Terminal Leave, and she has a four day deadline to solve the case, when Gibbs walks away there's an overhead shot and multiple chalk T-marks are visible on the ground. (00:05:00)
Lt. Jane Doe - S2-E4
Visible crew/equipment: While Gibbs is interrogating Cluxton they are alone in the room, and when he shows her Harlan Wilson's death certificate, in the overhead shot as she begins to snap, the leg of a crew member is visible on the right side of the screen. (00:42:05)
Visible crew/equipment: While Ducky and Gibbs are at the crime scene in the field, in the long shot just as Ducky says, "He took a tumble down the hill," the raised camera crane, camera, and camera operator (feet are dangling off the front of the crane platform) are visible at the left side of the screen. (00:04:10)
Forced Entry - S2-E9
Visible crew/equipment: After Tony gives McGee the coffee belonging to Gibbs, when it cuts to inside Laura Rowans' house, just as the Sergeant tells Gibbs, "The perp broke in, tried to rape her, she shot him," the boom operator (wearing a blue shirt) holding the boom pole is reflected on the framed picture's glass. He's visible again when Caitlin and McGee walk in. (00:02:30)
Heart Break - S2-E8
Visible crew/equipment: After Gibbs tells Tony to go down to Forensics to go over the physical evidence, when it cuts to Ducky walking into Autopsy while saying good morning to Jimmy, the reflections of the camera operator and camera are visible on the steel door. (00:34:30)
Visible crew/equipment: While in the morgue, Ducky asks Palmer if his recorder is on, and in the next shot a crew member wearing an orange shirt is visible on the right side of the screen. A few shots later, as Ducky talks about cause of death, we see another crew member on the left side of the screen. (00:08:40)
See No Evil - S2-E1
Visible crew/equipment: While Sandy is helping NCIS by listening to the feed, Gibbs asks her if she can "remember anything else about the train sounds," and in the next shot we can see the reflection of the boom pole/mic (being held overhead) on the steel surface behind Abby. (00:34:05)
Visible crew/equipment: When Gibbs pulls the U-turn, there are markers visible on the road to indicate where to do the turn. (00:29:55)
Visible crew/equipment: At the very start as the camera pans over the sign saying base housing, the camera crew are reflected in the sign. (00:00:10)
Visible crew/equipment: When Dr. Mallard is talking to Mr. Palmer about a "White Elephant", you can briefly see crew members on the stainless steel door on the left of the screen. They are blurry, but distinguishable. (00:23:55)
Bikini Wax - S2-E18
Visible crew/equipment: When enquiring about the rims, a camera is reflected in the paintwork of the truck. (00:25:20)
Black Water - S2-E11
Visible crew/equipment: When interviewing Tom at the airfield, tape markers can be seen at Kate and Tony's feet. (00:16:30)
Black Water - S2-E11
Visible crew/equipment: When Gibbs asks if the trooper believes McAlastair is in the lake, a boom mic cover can be seen very briefly on the top left of the screen. (00:05:25)
Heart Break - S2-E8
Visible crew/equipment: When Evan is ID'd at the morgue, a crew member can be seen reflected in the shiny door. They have a black jacket on, when no-one in the room has a black jacket. (00:30:30)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.