Shaggy,
What Lineslug said. I don't know Cactus Crew's background, other than he said he doesn't expect to upgrade to Captain before he retires. As Lineslug stated, if he chose to do twenty years AD, then it's hard to complain about his future chances of upgrading to captain. In Cactuscrews case that didn't apply.
No grenade lob intended on my part.