Turtles to the Sea
Novelette 10,537 words Recommended by 2 award/anthology sources
"It’s a little awkward,” Major William Bristol said, after they’d been briefed. “That your ancestors owned my ancestors?” Captain Johnny Winstead raised an eyebrow and tilted his chair back from the conference table, which had been painted sea green. “I promise not to hold it against you, Bill.” Bristol smiled thinly."
Quasar links out; the story lives on Asimov's, where the author gets the click.