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In the late-2260s and early 2270s, Lieutenant Commander Espinoza was chief engineer aboard the Constitution-class Federation starship USS Yorktown, under the command of Commodore Robbins. (TOS comic: "Schism, Issue 2")
|USS Yorktown personnel|
|United Earth, Earth Starfleet||USS Yorktown (Daedalus-class)||Albertson • Fleming • Giannini • Krawczak • Mayweather • Mendez • Shosetsu|
|Federation, Starfleet||USS Yorktown (Constitution-class)||Amekentra • Carlos • Conroy • Decker • Espinoza • Fenig • Gaines • Gauvreau • Hax • von Holtzbrinck • Jarboe • Lawford • Number One • Pike • Randolph • Sunak • Thonen|
|USS Yorktown (Excelsior-class)||Conlon • Ledbetter • Riker|
|USS Yorktown (Zodiac-class)||Kentrav • Hawk • Zimmerman|
| USS Yorktown (NCC-1717)|
|Isaac Garrett • 0718|