Headquarters

Overview
The Headquarters (or simply HQ) is a defensive building originating in the first game of the series, The Conquerors. It's the strongest building in the game, dealing twice as much damage as the Fort and about 1.5x more damage than the Command Center. Unlike other defensive buildings, a player can't have more than 1 HQ at the same time. Other than that, the Headquarters can also garrison up to 8 units inside.

Usage
Because of their strength and cost, HQs are mainly used in the end-game alongside with the Nuclear Silo and the Nuke. Despite general belief, a Headquarters will not substitute a Command Center. Although both are defensive buildings and can garrison units, the CC lets you make other units in your ally's production buildings and units, a powerful feature that is needed in almost every match.

Basic Strategy

 * As stated in the Construction Soldier strategy section, when trying to destroy an enemy base at the end-game it's smart to set up a base near theirs. Use a construction soldier and protect the yard until you can make an HQ or CC. If their income buildings were destroyed beforehand, they'll have nowhere to escape, although this works better in naval maps after destroying their docks.
 * Build your Headquarters near priorities, for example, your base. This will make rushes and other types of attacks way more likely to fail and will make important buildings not go down as quickly.
 * If on Survival, defensive buildings should be a priority, always make them near the middle while keeping them protected.
 * Turrets and Forts are more cost effective defensive measures than the HQ. The HQ should mainly be used as a way of getting lots of firepower while using as few of the limited housing spaces as possible.

Trivia

 * In The Conquerors Mark II, HQs are able to create the Mobile Fortress, one of the most(if not the most) powerful units in the game. Unfortunately, the unit wasn't added to TC3.
 * This isn't only the strongest building, but the biggest and second most expensive building in the game, with Nuclear Silo being the first.
 * The Headquarters was in three games of The Conquerors series.
 * A building called "The Core" was supposed to be an upgraded version of the HQ, with more turrets and a bigger base that allowed players to build every single unit within the game, this unit was scrapped though during the development process of The Conquerors 3.