David James Elliott Lt., Lt. Cmdr. Harmon "Harm" Rabb, Jr. Actor Catherine Bell Maj., Lt. Col. Sarah "Mac" MacKenzie Actor John M. Jackson Actor Patrick Laborteaux Lt. j.g., Lt. Bud Roberts Actor Karri Turner Ensign, Lt. j.g. Harriet Sims Actor Chuck Carrington Actor Scott Lawrence Cmdr. Sturgis Turner Actor Nanci Chambers Actor Steven Culp Guest Star Randy Vasquez Guest Star Isabella Hofmann Guest Star Zoe McLellan Petty Officer Jennifer Coates Guest Star David Akert Guest Star Louis Aguirre Guest Star Marco Rodríguez Guest Star Steve Heinze Guest Star Ali Afshar Guest Star Claudette Nevins Guest Star Mark Humphrey Guest Star Dean Butler Guest Star Adam Nelson Guest Star Richard Whiten Guest Star Rosie Malek-Yonan Guest Star Marc-Allen Barker Guest Star Donald P. Bellisario Executive Producer Charles Floyd Johnson Executive Producer Stephen Zito Executive Producer Mark Horowitz Executive Producer Bradford May Director Dana Coen Writer