Quark, Rom, and Nog, who were in the shuttle when it crashed, were kept in an examination room on the other side of the base, but were able to escape with the assistance of two helpful Humans, retrieve their ship and return to their own time by recreating the time warp. (DS9: "Little Green Men")
In UFO conspiracy lore, Hangar 18 was a facility located at Wright-Patterson Air Force Base in Ohio where various recovered alien spacecraft, including the one recovered at Roswell, were stored. This implies that the majority of Quark, Rom, and Nog's stay in 1947 actually took place in Ohio, not Roswell. The Encyclopedia (4th ed., vol. 1, p. 325) located "Hangar 18" in Wright Field.