Assertion: station's facility | /r/AtLocation | civil airports
Facets:
value: in a secure cantonment area
type: LOCATION
value: often
type: TEMPORAL
Source sentences:
text: Facilities of the Air National Guard are often located on civil airports in a secure cantonment area not accessible to the general public, though some units are based on USAF bases, and a few ANG-operated bases, such as Selfridge ANGB, Michigan.