The recruitment pamphlets the Petty Officer hands to the high school student in the opening scene, as well as those later strewn about in the stairwell, are Marine Corps publications, not Navy. The Marine Corps Emblem, the Eagle, Globe and Anchor, are clearly visible on the front.
When DiNozzo shows Paul Simmons the file of the Petty Officer, the name "Lt. Clea Thorson" is clearly visible. Thorson was the murder victim earlier in the season in the episode "NCIS" (2010) {Cracked (#8.6)}_.
When Ziva shows Paul Simmons and his father the photo of Petty Officer Simon Craig, the information references Lt. Clea Thorson. Thorson was the victim in Cracked (2010).
When the Petty Officer's ID is shown on the big screen, it lists his rating (rank) as E-4, Petty Officers 1st Class are E-6.