Thick smoke and rough terrain make surveying of the fireline crucial.(Exact date unknown)

Chicago citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-. Thick smoke and rough terrain make surveying of the fireline crucial.(Exact date unknown). 1994-10-01. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6498374. (Accessed June 23, 2018.)
APA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-, (1994-10-01) Thick smoke and rough terrain make surveying of the fireline crucial.(Exact date unknown). Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6498374
MLA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/6498374>.
Note: These citations are programmatically generated and may be incomplete.