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 Steven Culp Guest Star Carmen Argenziano Guest Star Tom O'Brien Guest Star Sal Landi Guest Star Ingo Neuhaus Guest Star Melody Rogers Guest Star Jay Taylor Guest Star Steve Florian Guest Star Chuck Carrington Guest Star Craig Barnett Guest Star Mitch Gibney Guest Star John Roselius Guest Star Kipp Shiotani Guest Star D. Elliot Woods Guest Star Robert Knott Guest Star Jody Wood Guest Star James Ingersoll Guest Star Donald P. Bellisario Executive Producer, Writer Les Landau Director