External Tank

Historical marker location:

1 Tranquilty Base, Huntsville, Alabama

( Marker can be reached from Tranquilty Base, ½ mile west of Madison Pike, on the left when traveling west.)

Liquid Propellent Supply for Space Shuttle Main Engines.

The Confederate submarine H.L. Hunley, which was the first submarine to sink an enemy ship in combat, was built in Mobile, Alabama in 1863.