Fictional
The OV-15 (made by General Aerospace) is an American twin-turboprop light attack and observation aircraft. It was developed in the 1980s as a special aircraft for counter-insurgency (COIN) combat, made to replace the OV-10 and one of its primary missions was as a forward air control (FAC) aircraft. It can carry up to 3,200 lb of external munitions, internal loads such as paratroopers or stretchers, and loiter for three or more hours. The aircraft was initially conceived in the early 1960s through an informal collaboration between WH Beckett and Colonel KP Rice, U.S. Marine Corps, who met at Naval Air Weapons Station China Lake, California, and who also happened to live near each other. The original concept was for a rugged, simple, close air support aircraft integrated with forward ground operations. At the time, the U.S. Army was still experimenting with armed helicopters, and the U.S. Air Force was not interested in close air support.

The OV-15B has an updated airframe design to accommodate for the new electronics and avionics. With this update the aircraft is much more affective in it's intended role of small ground strike and light CAS. The current update has included internally fix EC pod and targeting pod. New 30mm auto gun, updated cockpit, better navigation lights and much more! Possible future updates could included but not limited to

New Engine

Better Weapons

Increased Armor

Enhanced Wings

Naval Version

The concept aircraft was to operate from expedient forward air bases using roads as runways. Speed was to be from very slow to medium subsonic, with much longer loiter times than a pure jet. Efficient turboprop engines would give better performance than piston engines. Weapons were to be mounted on the centerline to get efficient unranged aiming like the Lockheed P-38 Lightning and North American F-86 Sabre aircraft. The inventors favored strafing weapons such as self-loading recoilless rifles, which could deliver aimed explosive shells with less recoil than cannons, and a lower per-round weight than rockets. The airframe was to be designed to avoid the back blast.
https://en.m.wikipedia.org/wiki/NorthAmericanRockwellOV-10Bronco