Generals Alpha is an OpenRA mod that recreates Command & Conquer: Generals on OpenRA engine as much as possible but using Red Alert and Tiberian Dawn artworks.
Bomb Trucks, unlike in original, can be upgraded with either bio bombs, or high explosive bombs. They now always have disguise ability.
SCUD Launcher also gets upgrades to select either Toxin or High Explosive Missiles, but, unlike original, once selected you can't change them back, and unlike others are free and instant.
Hijacker lost is disguise ability, as it was just my balance attempt, not something from original game.
USA Strategies can now be switched midgame, but they now take 7 seconds on normal speed to build.