In the NCIS: Los Angeles episode “The Guardian,” NCIS Special Agents Callen (Chris O’Donnell) and Sam Hanna (LL Cool J) travel to the USS Allegiance in the Persian Gulf. There they work with Navy Captain Harmon “Harm” Rabb, Jr. to track down ISIS sympathizers who are targeting military locations. Rabb is portrayed by David James Elliott, who is reprising his role as Rabb from his days on the hit show JAG.
The 6’4” actor is also known for his roles on Secrets and Lies (Major Bryant), Mad Men (Dave Wooster), GCB (rip Cockburn), Scoundrels (Wolf West), Close to Home (James Conlon), and The Untouchables (Agent Paul Robbins), among others. Elliott is also recognized for his roles in films including Trumbo (John Wayne). Fun fact: Elliott is married to his former JAG co-star Nanci Chambers, who played Lt. Loren Singer. NCIS: Los Angeles airs Sundays at 10 pm on CBS.