This is one of two 16 inch guns, used for defense on Cabrillo National Monument site. The magnitude of these weapons are showcased by the sheer size visible by a woman posing for this picture.
From right to left: Ed Fletcher, Mrs. William Paxton Cary, Mrs. Ed Fletcher, Mrs Joe Dryer, Joe Dryer, Superintendent Don Robinson posing in front of Cabrillo Statue at 1949 Cabrillo National Monument Dedication in Point Loma.
A Proclamation, by the President of the United States Dwight D. Eisenhower titled "Enlarging the Boundaries of the Cabrillo National Monument, California"