It was designed to carry vehicles across the battlefield, ignoring the restrictions of terrain, Tiberium or, in some cases, enemy defenses. Carryalls are much faster than all GDI ground units. This unit epitome GDI power projection capability similar to Nod's Subterranean APC, but with different weaknesses and strengths.
Powerful units such as Disruptors or even the Mammoth Mk. II became much more dangerous when ferried across the battlefield by Carryalls. When used with an APC, it can also be used to transport entire squads of infantry across the map. Unfortunately, it has weak armour, so care must be taken when flying across a potentially dangerous zone.
For all intents and purposes, the Carryall was superseded by the V-35 Ox, a VTOL ordnance delivery craft, while in a twist of irony, Nod adopted the Carryall's design, creating their own version of the craft.
The Carryall can pick up any ground vehicle in the game. Though the Carryall cannot transport infantry directly, troops may be placed into an APC, and then the APC can be picked up and flown to the target destination. To use the Carryall, simply select it, then left-click on the unit to be picked up. The Carryall will then fly to the unit and latch on to it. Giving a move command to the loaded Carryall will then cause it to fly to the destination and drop off the vehicle, though subsequent move commands can also be given to it while still airborne to change the dropzone or to simply keep it in the air temporarily. As the Carryall allows a GDI commander to move his most powerful units around the battlefield quickly and to bypass enemy defenses, this unit is an invaluable part of their arsenal.
The Orca Carryall design was retired, but utilized by Nod by the Third Tiberium War, with their own Carryall. Both have four engines and a large loading capacities, but the Nod version was able to ferry infantry squads.