See Brennan for other articles with titles that contain, either by relationship or by coincidence, this character's surname.

BIOGRAPHY
Brennan
Species:	Human
Gender:	male
Affiliation:	Federation, Starfleet
Career
Assignment:	security officer, USS Enterprise (2269)
Insignia:

Brennan was a 23rd century human man, Starfleet officer assigned to the Federation starship USS Enterprise in the late 2260s.

Brennan was assigned to the Enterprise's security division. In 2269, Brennan was leader of a security team that boarded the starship Ransom Castle after a Romulan attack. Brennan and his men located several injured crewmembers locked in cargo holds while pursuing Romulan lifeform readings. (TOS novel: The Great Starship Race)

Brennan was referred to simply as "officer" which would seem to indicate he was an ensign or lieutenant, but his exact grade was not specified.

USS Enterprise (NCC-1701) security & tactical personnel
under Robert April	F.D. Reed	under Christopher Pike	Bryce • Collins • Endel • Hardin • Orloff • D. Reed • Ross • Smith • Takahara • Tuval • Valdini
under James T. Kirk (first five-year mission)	Abrams • al Auriga • al-Baslama • Alan • Ames • Anderson • Anderson's impostor • Apple • Archer • Aristeides • Arrunja • Atete • Autry • Bailey • Bardoli • Baxter • Beason • Beltre • Berengaria • Boggs • Borido • Bounds • Brennan • Brentano • Brickston • Buchert • Butterfield • Carlisle • Carlucci • Carver • Chavez • Chekov • Chevalier • Ching • Collier • Collins • Compton • Corcoran • Cordova • Creighton • Cruz • Darnell • Davison • Davoff • DeCamp • DeCastro • Devereaux • Dickerson • Digard • Doyle • Dunhill • Endercott • Esswein • Evans • Everts • Ferris • Fields • Fitzgerald • Freeman • Flynn • Franklin • Friedman • Fuller • Gabler • Gallagher • Galloway • Garrovick • Gary • Gemas • Giotto • Gomez • Grant • Hacker • Hadley • Hallie • Hanashiro • Harrison • Hasmid • Hendorff • Herring • Hevelin • Hilambo • Hixon • Hrolfson • Huff • Inciviglia • Jakobs • Jameson • Jamison • Johnson • Johnstone • Josephs • Kaplan • A. Kaplan • Kasuki • Kelly • Kellum • Lamia • Lemli • Leskanich • Leslie • Lewis • Lindenbaum • Lindsay • Ling • Lopez • Lowry • Mallory • Manning • Marple • Masaryk • Masters • Mathews • Matthews • McGaren • Montgomery • Meyers • Michaels • Mocre • Moore • Mosley • Nairobi • Namura • Ndugu • Neal • Nelson • Neon • Nguyen • Nored • O'Herlihy • O'Hyr • Olag • Olaus • O'Neill • Onorax • Ordover • Organa • Osborne • O'Shay • Oyama • Paikert • Patten • Pauli • Phillips • Ragsdale • Rainer • Rayburn • Reems • Reichert • Rivera • Rizzo • Robinson • Rowe • Sanders • Schang • Shanti • Shea • Sheckley • Shimada • Silverman • Snnanagfashtalli • Spencer • Stanger • Steib • Steinberg • Stragey • Suarez • Swensen • Tamura • Tanka • Thomas • Thorton • Timmons • Tomson • Trancas • Trucco • Tuan • Ush • Valdini • van Dreenan • Van Pelt • Vinci • Vorozh • Wein • Wheeler • Williams • Wilson • Wodsworth • Wolfman • Wood • Worsley
subsequent missions under Kirk & Spock	Aragonés • Arrunja • Anderson • Barnes • Barrasso • Bergstresser • Byrnes • Carver • Chavez • Chekov • th'Clane • Coffey • Collins • Corey • Davidson • Dobius • Emigh • Estano • Fox • Friedman • Galloway • Howard • Hrdina • Jaffe • Jagr • Kelowitz • Keth • Kinitz • Lemieux • Leno • Markson • Matlock • Mendoza • Merlino • Mosley • Mullen • Murphy • Nizhoni • Ohara • Padilla • Paek • Pearson • Perez • Pfeiffer • Phillips • Mark Publicker • Pulaski • Ralston • Ramirez • Randall • Recchi • Richardson • R'leez • Robinson • Samuelsson • Santana • Sternbach • St. John • Sweeny • Tanka • Tate • Tenzing • Tiilson • Tocchet • Trottier • Vlastikovich • Wagner • Worene • Workman
see also: administrative personnel • communications personnel • engineering personnel • medical personnel • pilots & flight control personnel • sciences personnel • senior staff • unnamed