WASHINGTON — Supreme Court police officers last fall staffed a table at Washington’s armory, where runners picked up their numbers and T-shirts for the Army 10-Miler road race. The officers were promoting an entirely different kind of competition, seeking to recruit new officers in a tight employment market.High court personnel also are showing up on college campuses and military bases to try to fill some of the many vacancies on a police force that’s charged with protecting the nine justices and the …