Art Evolution: In version 1.20, the Chem Warrior and Shock Trooper were given new, heavier-looking graphics to make it clear that they are uncrushable.
Arbitrary Minimum Range: Land artillery and the Behemoth have a minimum range which means that destroying them is going to be easy if you get close enough and these vehicles have nothing defending them.
Tank, one Behemoth, one Project 941, one Illuminator, three A-10 Warthogs or runways for them, three SS-22N Nuke Launchers (unlocked by the Civil Tech Center) or three railgun Mammoth Tanks (exclusive to the Cloaked Twilight co-op) can be built at a time, despite being not one-of-a-kind in the lore.
Arbitrary Headcount Limit: Only one Commando, one Hijacker, one Cyborg Prototype, one Chrono Tank, one Enforcer, one M.A.D.
Angry Guard Dog: Soviet Attack Dogs are able to maul infantry to death.
Amphibious Automobile: Amphibious Transports and the campaign-exclusive GDI Hover MLRS and Nod Chemical Hovercraft can float over land and water alike.
All Your Base Are Belong to Us: An engineer raid can easily see half your enemy's base fall to you in one fell swoop.
Adapted Out: Due to the limitations of the Tiberian Sun engine, some units from Red Alert had to be removed: the Allies lost Thieves, Radar Jammers and both types of Gap Generators, the Soviets lost Chitzkoi, the Hind and the Iron Curtain, and both factions lost the Minelayers.
Adaptation Name Change: Two of the Allied ships from Red Alert have been renamed: Gunboat to Corvette and Destroyer to Frigate.