John Martin (TOS Era)

Commander John Martin is a human male who lives in the 23rd century and services in Starfleet and the Federation and is the son of Commodore James Martin and Fleet Captain Maria Martin and the husband of Commander Jo Harris and services the Helena as the first officer on board the USS Explorer (NCC-1966). (Star Trek: Explorer)

Early life
John Martin was born in 2233 in San Diego, Califorina on Earth. His mother was Admiral Maria Martin. John moved to Starbase 39-Sierra along the Romulan Neutral Zone during peace time with the Romulan Star Empire while Maria was stationed on the Klingon outpost Narendra III. While on a mission to keep the treaty enforced, the outpost suddenly came under attack by four Romulan warbirds, while on the outpost, his mother was wounded.

Starfleet Academy
In 2254, at age 21, he entered Starfleet Academy. Then he met his best friend Typhuss James Halliwell in his command class one day in 2254 and the two became best friends, brothers even, John worked together with Typhuss to get their work done and then Martin and Typhuss graduated in 2258.

USS Republic
Martin graduated near the top of his class at Starfleet Academy. Later as an officer of the USS Republic he saved the lives of his landing party by showing the inhabitants of an alien world that tricorders were not offensive weapons.