Jump-jet Infantry

Jump jet infantry, or more colloquially, JJIs, were used as scouts and attack units by the Global Defense Initiative.

Description
JJI's were powerful infantry that were about as costly as Cyborgs, and also about as useful. They were heavy infantry armed with chainguns similar to that of the Cyborg. However, on the ground they were faster than Cyborgs, while in the air they were much faster than Cyborgs. During the Second Tiberium War, they could go places that a regular infantry unit couldn't go, and were also used as strike units.

Firestorm Crisis Upgrades
During the Firestorm Crisis, GDI decided that Jump Jet Infantry weren't good enough, so they produced an upgrade package. Jump Jet Infantry that received the package had upgraded sensors, allowing them to detect stealthed units such as the infamous stealth bases, as well as Mobile Stealth Generators. This made them even more effective as scouts.

Usage
JJIs were generally used as scouts, and in groups, they could tear apart any non anti aircraft unit on the ground, including the Cyborg Commando. However, while they were in the air, they were very vulnerable to Ion Storms, and would come plummeting from the sky during an ion storm. Furthermore, in flight they were also vulnerable to anti-aircraft missiles, and owing to their fragileness and lack of anti-structure or anti-vehicle armament, they generally did not attack heavily fortified bases or enemy attack collumns.