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 Jay Leno 1 guest appearances Submarine Captain 1 guest appearances Dirk Grover 1 guest appearances CPO Grisham 1 guest appearances LCDR Scott 1 guest appearances Weapons Officer 1 guest appearances COB 1 guest appearances Helmsman 1 guest appearances Secret Service Agent 1 guest appearances Lookout 1 guest appearances Planesman 1 guest appearances CDR Holbarth 1 guest appearances LT Lamm 1 guest appearances LT Sarah Williams 1 guest appearances NCIS Agent Brian Turque 1 guest appearances GySgt Cahill 1 guest appearances LT Diane Schonke 1 guest appearances Colonel Matthew O'Hara 1 guest appearances CAPT Cahill 1 guest appearances SGT Riske 1 guest appearances ⇤ « 3 4 5 6 7 8 9 10 11 12 » ⇥