The Orca fighter is the successor to GDI's ORCA Assault Craft fielded during the First Tiberium War.
The acronym was officially adopted as a codename for the family of aircraft developed on the base of the assault craft, while the original concept was overhauled and redesigned, resulting in the creation of the Orca Fighter, which replaced most of GDI fighter jets.
The Fighter itself remains a VTOL based aerial assault vehicle, with revamped and miniaturized engines. The armor is upgraded and the craft is now armed with Hellfire missiles. The chin mounted minigun was removed from the design, as the fighter's main role is engaging armor with guided missiles, and the chaingun proved to be ineffective at killing infantry and unwieldy when used.
Additional role for the fighter is providing cover for slower, more vulnerable Orca Bombers and harassing anti-aircraft defenses until the bombers can reach their targets.