Question: How many matches have been played by the U.S. mens national soccer team in the stadium that hosted the 2011 Military Bowl? 

Context paragraphs:
Robert F. Kennedy Memorial Stadium: 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.

Chicago Slovak: The Chicago Slovaks were a Chicago soccer team that was based in Berwyn, Illinois.  They were the 1941 winners of the Kelley Cup.  I. 1942 and 1951 the Chicago Slovaks won the Peter J. Peel Callenge Cup.  They tied with the Vikings for the Peel cup in 1943.  They participated in the National Soccer League and won in 1951, 1952, and 1954.  Some of their players during that time were Pete Matevich, who earned 4 caps for the United States men's national soccer team, Bill Conterio, who was a member of the United States soccer team at the 1952 and 1956 Summer Olympics, and also Gino Gardassanich, who played for multiple clubs in Croatia, and also earned 6 caps with the United States men's national soccer team

2011 Military Bowl: 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.

Paul E. Joseph Stadium: Paul E. Joseph Stadium was a multi-use stadium in Frederiksted, St. Croix, United States Virgin Islands.  It was used mostly for soccer matches, as well as baseball and American football.  It hosted some home matches for the United States Virgin Islands national soccer team.  The stadium held 5,000 spectators.  On March 31, 1967 it hosted the first MLB exhibition game played in the Virgin Islands when the New York Yankees played the Boston Red Sox.  The stadium had also hosted cricket matches, playing host to a single first-class match between West Indies B and Guyana in 2003.  This was the first time first-class cricket had been played in the U.S. Virgin Islands.

The American Outlaws: The American Outlaws (abbreviation: AO) are an unofficial supporters' group for the United States men's national soccer team and United States women's national soccer team and have been described as "a raucous group of U.S. supporters" by ESPN.  Founded in 2007 by a group of fans from Lincoln, Nebraska, the group set out to "unite and strengthen" supporters at United States national soccer team games.

Nigeria national under-20 football team: The Nigeria U-20 men's national soccer team, also known as the Nigeria Under-20s or nicknamed the "Flying Eagles", is the youth team for national soccer in Nigeria.  It plays a large role in the development of Nigerian soccer, and is considered to be the feeder team for the Nigeria men's national soccer team and is controlled by the Nigeria Football Federation.

U.S. Women's National Team Players Association: The U.S. Women's National Soccer Team Players Association (USWNSTPA) is a labor union representing women soccer players in the United States, including the United States women's national soccer team.  In 2016, the union was in a dispute with the soccer league over the end date of the collective bargaining agreement.  U.S. Soccer says the agreement goes through the Olympics in Rio de Janeiro.  The Players Association maintains it can be terminated at any time.  On March 31, 2016, five members of the U.S. Women's National Soccer Team filed a charge with the Equal Employment Opportunity Commission alleging wage discrimination as women soccer players earn less money than players on the men's team.

Caleb Norkus: Joshua Caleb Norkus (born March 14, 1979 in Raleigh, North Carolina) is an American soccer player who currently plays for the National Premier Soccer League club Puerto Rico Bayamón.  He played professionally in Germany, Chile, Puerto Rico and the United States.  He was a member of the United States U-17 men's national soccer team at the 1995 FIFA U-17 World Championship held in Quito, Ecuador, as well as the United States U-18 men's national soccer team and the United States U-20 men's national soccer team.

Lauren Gregg: Lauren Gregg (born June 20, 1960) is an American soccer coach and retired soccer player who played as a defender for the United States women's national soccer team.  She was the first-ever female assistant coach for any of the United States' national teams and was head coach of the United States women's national soccer team in 1997 and 2000.  As head coach of the women's soccer team at the University of Virginia from 1986 to 1995, Gregg was the first woman to lead a team to the NCAA Division I Final Four and to be named NSCAA Coach of the Year.

1985 United States women's national soccer team: The 1985 United States women's national soccer team was the first United States women's national soccer team to play international matches.  The team played four matches in Jesolo, Italy, at the Mundialito tournament, losing three and drawing one of the matches.

Supporting paragraphs: 2011 Military Bowl Robert F. Kennedy Memorial Stadium
Answer: 22