Lore I guess? :

The FG-100 is a subsonic attacker aircraft. It's ugly appearance is why it has given the name "Dorkface" .It is not a loveable aircraft to their pilots. It has very poor visibility that cause landing this aircraft is a nightmares. Despite this, the aircraft was proven very effective in combat. This is thanks to it's 50mm canon that can penetrate through heavy tanks. The aircraft can also be arme with artillery rounds.

The aircraft is equipped with radar and infrared sensors for targeting purposes. In addition to these, the aircraft can carries Air to Air missiles.
Due to its ability to carry large amounts of ordnance, even if the aircraft gets shot down, it will usually manage to inflict some damage before being destroyed.