A shakedown cruise is a limited sea excursion for the purpose of testing all the working equipment of a ship before putting the vessel in service; A way of testing the performance of a ship. Generally, shakedown cruises are performed before a ship enters service or after major changes such as a crew change, repair or overhaul.
At 6:15 Tavo mispronounces the name of the island Grenada. Instead of the proper "GREYnada" he says "GRAHada". Grenada is a Caribbean island; Granada is a city on Spain's Mediterranean coast.
KIA is Killed In Action.
Danny jokingly asks one of the Marines why Navy Corpsman deploy with them. The Marine Corps is strictly a fighting force, they do not have a medical branch and therefore do not have combat medics. But as the Marine Corps is part of the Department of the Navy, most Marine Corps units have Navy Corpsman that deploy with them in the field, the corpsman train right alongside the Marine unit they are assigned to and are highly respected by the Marines they work with, which is why Marine's often call their Navy corpsman "Doc".