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 Guest Star Chuck Carrington Guest Star Nanci Chambers Guest Star Tamlyn Tomita Guest Star Zoe McLellan Petty Officer Jennifer Coates Guest Star Isabella Hofmann Guest Star Scott Paulin Guest Star Brixton Karnes Guest Star Bill Kemp Guest Star Troy Ruptash Guest Star Tom Bresnahan Guest Star Miguel Angel Caballero Guest Star Michael Kagen Guest Star Andrew Heffernan Guest Star Donald P. Bellisario Executive Producer Charles Floyd Johnson Executive Producer Stephen Zito Executive Producer Mark Horowitz Executive Producer