Stronghold design is a natural upgrade over a standard fortification. Strongholds have a smaller footprint, which mean they are easier to establish. Presumably these structures also comes prefab and orbital dropped. These features have the additional advantage of negating bug tunnel ambush, as the weight and the material itself would serve as an additional barrier that any tunnel underneath would be collapsed due to the weight.
Basically a stronghold is an enclosed, multistory structure with a dwelling level and life sustaining facilities installed. These features gave protection to any personnel (or any creature) from adverse external environmental hazards, but with little room for any other specific-purpose other than an outpost. A landing pad is available on the top level.
- Main article: Battle of Zulu Alpha
During the First Bug War, a Stronghold called Hotel Delta 1-8-5 is seen when a defeated Mobile Infantry force retreats to it. The force holds out in the outpost until overrun by Warrior Bugs after several hours.
During the Battle of Hesperus several Strongholds containing Fuel reserves were utilized by the UCF to fuel up many fuel tankers. These Strongholds were held for just enough time during the battle to extract the fuel before their defenses were overrun by an Arachnid assault.
Defenses on Strongholds vary from one to another depending on their purpose. The Stongholds on Hesperus, due to containing valuable fuel, had trenches, bunkers, and Mounted Heavy Machineguns in defensive positions along the exterior.
All Strongholds, however, do have electric pillars positioned around a perimeter which shock and kill anything that pass by them. All Strongholds also contain Vapor Explosives that are launched from the top of the base and create a massive explosion all across the base perimeter. The last of the defenses are large rectangular blocks sticking out of the ground for soldiers to cover behind.