The London Olympics are less than 100 days away, and while some military athletes have already punched their tickets (and keep checking here for new Army qualifiers), the trials have yet to start in earnest. That changes this weekend in Iowa City. About 30 wrestlers with military affiliations will compete in the Greco-Roman and freestyle (men’s and women’s) tournaments to determine who’ll represent the U.S. on the mats. Click through for a quick guide for the once-every-four-years wrestling fan — the troops, the favorites, the story lines, the TV coverage and, of course, the flying squirrel.