Main Characters Captain Harmon "Harm" Rabb Jr., USN 227 main appearances Captain Bud J. Roberts Jr., USN 96 main appearances Lieutenant Colonel Sarah "Mac" MacKenzie, USMC 99 main appearances Rear Admiral A.J. Chegwidden, USN 86 main appearances Lieutenant Harriet Sims-Roberts, USN 50 main appearances Yeoman First Class (YN1) Jason Tiner, USN 49 main appearances Lieutenant Commander Mic Brumby, CSC, RAN 40 main appearances Gunnery Sergeant Victor Galindez, USMC 37 main appearances Lieutenant Loren Singer, USN 19 main appearances Special Agent Clayton Webb 15 main appearances Commander Peter Ulysses "Sturgis" Turner, USN 20 main appearances Lieutenant, Junior Grade Megan "Meg" Austin, USN 20 main appearances Legalman First Class (LN1) Jennifer "Jen" Coates, USN 10 main appearances Midshipman Third Class Michael "Mikey" Roberts, USNA 3 main appearances Rear Admiral Thomas "CAG" Boone, USN 3 main appearances Major General Gordon "Biff" Cresswell, USMC 4 main appearances Commander Caitlin "Kate" Pike, USN 2 main appearances Lieutenant Gregory Vukovic, USN 2 main appearances
Recurring Guest Characters Craig Allenby 1 guest appearances NCIS Agent Lisa Viola 1 guest appearances Francesca Paretti 1 guest appearances VADM Bill Clancy 1 guest appearances Chaplain 1 guest appearances Dr. Roland 1 guest appearances Linda Reynolds 1 guest appearances ADM Yarbrough 1 guest appearances Tony Yoshigawa 1 guest appearances LT Quince 1 guest appearances Maj. Viktor Lushov 1 guest appearances Frank Burnett 1 guest appearances Hotel Desk Clerk 1 guest appearances Pilot 1 guest appearances Customs Inspector 1 guest appearances Hugh Blackadder 1 guest appearances Rusza 1 guest appearances Vasya 1 guest appearances Pitchta 1 guest appearances CDR Thomas Risnicki 1 guest appearances ⇤ « 6 7 8 9 10 11 12 13 14 15 » ⇥