3rd Air Defense Artillery Regiment
The 3rd Air Defense Artillery Regiment is an air defense artillery regiment of the United States Army, first formed in 1821 as the 3rd Regiment of Artillery.
Image: 3 ADA COA
Image: 3 ADA Rgt DUI
Battery A, 2nd U.S. Artillery and Batteries C&G (combined), 3rd U.S. Artillery near Fair Oaks, Virginia, June 1862. These were all horse artillery units at the time.
Fort Jefferson is a former U.S. military coastal fortress in the Dry Tortugas National Park of Florida. It is the largest brick masonry structure in the Americas, covering 16 acres (6.5 ha) and made with over 16 million bricks. Among United States forts, only Fort Monroe in Virginia and Fort Adams in Rhode Island are larger. The fort is located on Garden Key in the lower Florida Keys within the Dry Tortugas, 68 miles (109 km) west of the island of Key West. The Dry Tortugas are part of Monroe County in Florida.
Aerial view of Garden Key and Fort Jefferson
Moat
Aerial view of the fort in 1940
Lower archways of one interior side of Fort Jefferson. Many of the arches were designed by Capt. Daniel P. Woodbury, Superintending Engineer from 1856 to 1860.