"Tin Soldier" is a 17,500-word science fiction novella by American writer Joan D. Vinge, her first published work.
[1] "Tin Soldier" tells the story of Maris - an ex-soldier who, following wounds sustained in battle, has received cybernetic implants that, as a side effect, slow his aging to "about five years for every hundred" (he is 115 years old as the story begins, though physically he looks "about twenty-five") - and Brandy (short for Branduin), a female starship crewmember.
Only women are allowed to crew starships, since male bodies cannot handle the stresses of space travel.
(I may wind up someday feeling like Isaac Asimov, who complains that after all these years, people still like his first story best – everything has been downhill ever since.
The first was the song "Brandy (You're a Fine Girl)" by the band Looking Glass, which had been a Billboard Hot 100 #1 hit in 1972, shortly before Vinge wrote the story.