[PAR] [TLE] 2010 Pentagon shooting [SEP] On March 4, 2010, John Patrick Bedell shot and wounded two Pentagon police officers at a security checkpoint in the Pentagon station of the Washington Metro rapid transit system in Arlington County, Virginia, just outside Washington, D.C. The officers returned fire, striking him in the head.  He died a few hours later the next day. [PAR] [TLE] The Pentagon [SEP] The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia, across the Potomac River from Washington, D.C. As a symbol of the U.S. military, "The Pentagon" is often used metonymically to refer to the U.S. Department of Defense.
[PAR] [TLE] 2010 Pentagon shooting [ SEP ] On March 4 , 2010 , John Patrick Bedell shot and wounded two Pentagon police officers at a security checkpoint in the Pentagon station of the Washington Metro rapid transit system in Arlington County , Virginia , just outside Washington , D.C. The officers returned fire , striking him in the head . He died a few hours later the next day . [PAR] [TLE] The Pentagon [ SEP ] The Pentagon is the headquarters of the United States Department of Defense , located in Arlington County , Virginia , across the Potomac River from Washington , D.C. As a symbol of the U.S. military , " The Pentagon " is often used metonymically to refer to the U.S. Department of Defense .
The 2010 Pentagon shooting was an attack upon the headquarters of which U.S. department?
The 2010 Pentagon shooting was an attack upon the headquarters of which U.S. department ?
the U.S. Department of Defense
the U.S. Department of Defense