The term "MarDet" is a military abbreviation for "Marine Detachment". "MarDet Actual" means the commander of the detachment.
The missiles that are intended to be mounted on Pathfinder, the Phoenix, were real missiles formerly employed by the US Navy. Only capable of being launched from the F-14 Tomcat the Phoenix had a maximum range of 100 nautical miles.
The episode of Jeopardy! (1984) Bill is watching aired on September 27, 1984. Coincidentally (?) the three contestants in that game were named Larry, Karen, and Ed, which all happen to be names of characters on For All Mankind.