Alamo

The Alamo, originally known as Mission San Antonio de Valero, is a former Roman Catholic mission and fortress compound in San Antonio, Texas. The compound, which originally comprised a sanctuary and surrounding buildings, was built by the Spanish Empire in the 18th century for the education of local Native Americans after their conversion to Christianity. In 1793, the mission was secularized and soon abandoned. Ten years later, it became a fortress housing the Mexican Army group the Second Flying Company of San Carlos de Parras, who likely gave the mission the name "Alamo". When the Mexican army retreated from Texas at the end of the Texas Revolution, they tore down many of the Alamo walls and burned some of the buildings. Several years after Texas was annexed to the United States, the US Army began renting the facility for use as a quartermaster's depot. The US Army abandoned the mission in 1876 after nearby Fort Sam Houston was established.

Great World War III
The Alamo was turned into an American fortress during the 70s, a well defended base provided with many Prism towers and anti-air defenses. The base was used by President Dugan to hide himself from the soviets. However, they managed to find him but the fortress was too well defended to do a direct attack to capture the President, so the soviets decided to use some Psychic Corps to break into the base. After the Soviets managed to shut down the base's power, they made a break into the base destroying part of it, including The Alamo itself. However, Time Travel prevented this event to happen and therefore The Alamo is still standing on Texas.

More info can be found on the page about Operation The Fox And The Hound.