1.07: "Sub Rosa"
18.05.12

A DB is discovered in acid at a naval base and a partially visible tattoo of the tail of a dolphin suggests the DB was a submariner. An impostor has taken his place on the submarine.
Kate ( Sasha Alexander ) and her comment about how they'll get onto the submarine, well it isn't exactly in port is it, and the only available transport is a helo drop, as seen many times before on JAG. Many submarine episodes on JAG; including season 2's Cowboys and Cossacks, 4.16 Silent Service, 5.7 Rogue, 5.22 Overdue and Presumed Lost, 6.15 Iron Coffin, 7.23 Enemy Below, 8.7 Need to Know, 9.7 Close Quarters. So it had its healthy share of episodes set on submarines throughout its ten seasons. Some better than others.
Then Kate complaining about not wanting to be treated differently because she shaves her legs and not her face, but she does shave her face! So she's being singled out because she's a woman, she can't have it both ways, wanting to be one of the guys and wanting her sex not to be a hindrance. She's needed on the submarine since she's a profiler, so how good a job did she do, when it was Abby ( Pauley Perrette ) and Ducky ( David McCallum ) who came up with the missing crew member and put the photos together. She's looking forward to the nuclear sub more than she did Airforce One.
Source: PopStar.com Celebrity News