Is it true that a mosque was located inside of the Pentagon?

What is referred to as the "Pentagon mosque" is, more precisely, a non-denominational chapel which was built and dedicated in 2002 in honor of Pentagon employees and pengers of American Airlines Flight 77 who died in the September 11 attack. Daily Muslim prayer sessions are held there weekday afternoons, and weekly Muslim services are led by an imam from a local mosque every Friday, which means the room can be considered a mussallaah, a sacred space where Muslims "consistently perform their mid-day prayer when they do not have access to a mosque". This Muslim use of the Pentagon facility has drawn no complaints