Question: How many matches have been played by the U.S. mens national soccer team in the stadium that hosted the 2011 Military Bowl? 
Related documents: [0]  [DOC] Robert F. Kennedy Memorial Stadium, commonly known as RFK Stadium, is a multi-purpose stadium in Washington, D.C., located about two miles (3 km) due east of the U.S. Capitol building. It is the current home of D.C. United of Major League Soccer and the AT&T Nation's Football Classic. The U.S. men's national soccer team has played 22 matches there from 1977 to 2013, more than any other stadium. [END] 
[1]  [DOC] The 2011 Military Bowl Presented by Northrop Grumman, the fourth edition of the game, was a post-season American college football bowl game, held on December 28, 2011 at Robert F. Kennedy Memorial Stadium in Washington, D.C. as part of the 2011–12 NCAA bowl season. [END] 
Answer: 
22
22