The 16-inch guns aboard the battleship USS IOWA (BB-61) loom over crew members as the ship docks in home port. The IOWA has returned to Norfolk following an explosion in its No. 2 16-inch gun turret which killed 47 crew members on April 19th. The explosion occurred as the IOWA was conducting routine gunnery exercises approximately 300 miles northeast of Puerto Rico

Chicago citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-. The 16-inch guns aboard the battleship USS IOWA (BB-61) loom over crew members as the ship docks in home port. The IOWA has returned to Norfolk following an explosion in its No. 2 16-inch gun turret which killed 47 crew members on April 19th. The explosion occurred as the IOWA was conducting routine gunnery exercises approximately 300 miles northeast of Puerto Rico. 1989-04-23. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6444376. (Accessed July 19, 2018.)
APA citation style
Department of Defense. American Forces Information Service. Defense Visual Information Center. 1994-, (1989-04-23) The 16-inch guns aboard the battleship USS IOWA (BB-61) loom over crew members as the ship docks in home port. The IOWA has returned to Norfolk following an explosion in its No. 2 16-inch gun turret which killed 47 crew members on April 19th. The explosion occurred as the IOWA was conducting routine gunnery exercises approximately 300 miles northeast of Puerto Rico. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/6444376
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/6444376>.
Note: These citations are programmatically generated and may be incomplete.