David James Elliott Lt., Lt. Cmdr. Harmon "Harm" Rabb, Jr. Actor Catherine Bell Maj., Lt. Col. Sarah "Mac" MacKenzie Actor Patrick Laborteaux Lt. j.g., Lt. Bud Roberts Actor John M. Jackson Actor Scott Lawrence Cmdr. Sturgis Turner Guest Star Karri Turner Ensign, Lt. j.g. Harriet Sims Guest Star Chuck Carrington Guest Star Nanci Chambers Guest Star Michael Bellisario Guest Star Dean Stockwell Guest Star Paul Collins Guest Star Zoe McLellan Petty Officer Jennifer Coates Guest Star Scott Paulin Guest Star John D'Aquino Guest Star Jamison Yang Guest Star Christine Elise Guest Star John Livingston Guest Star Shari Rose Guest Star Brad Hawkins Guest Star Tanya Memme Guest Star Laura Putney Guest Star Michael Fairman Guest Star Matthew Lang Guest Star Lesli Margherita Guest Star Cameron Graham Guest Star Matthew Josten Guest Star Donald P. Bellisario Executive Producer Charles Floyd Johnson Executive Producer Stephen Zito Executive Producer Mark Horowitz Executive Producer