List of coastal fortifications of the United StatesW
List of coastal fortifications of the United States
Ammunition IglooW
Ammunition Igloo
Board of FortificationsW
Board of Fortifications
Howlett LineW
Howlett Line
Mexico–United States barrierW
Mexico–United States barrier
Mine Planter Service (U.S. Army)W
Mine Planter Service (U.S. Army)
Seacoast defense in the United StatesW
Seacoast defense in the United States
Station (frontier defensive structure)W
Station (frontier defensive structure)
Submarine mines in United States harbor defenseW
Submarine mines in United States harbor defense
United States Army Coast Artillery CorpsW
United States Army Coast Artillery Corps