Foxhole

From Command and Conquer Wiki

A defensive fighting position, the 'Foxhole is a sand-bagged, hard top bunker that can be constructed everywhere on the battlefield by a squad of GDI riflemen. A simple, but effective construction, it allows for up to 2 squads of infantry to attack the enemy while being protected from their fire.

However, the foxhole is quite easily destroyed by enemy explosives, such as missiles. Like the captured Civillian Buildings, the infantry inside could be killed in one shot if they are hit by Flame Weaponary, leaving the Foxhole intact.