The FSV upgrade package was meant to add an unmanned turret on LTV-22's, making it the standard. However, the package was simply too big which meant that the cargo carrying capabilities of the LTV-22 was lost. Armed with a rather large unmanned turret, equipped with a dual 25mm auto cannons the FSV is able to provide sufficient fire support for infantry units. The 25mm is able to fire Armor Piercing (AP) shells for armored targets and High Explosive Incendiery (HEI) for softer targets. Known as the "Fire Support Variant", FSV's are usually attached in LTV-22 units as escorts and for fire support purposes. 

The Fire Support Vehicle - Heavy variant is essentially a FSV but with larger guns. The Heavy is equipped with a dual 90mm rifled cannon that shoots High Velocity Armor Piercing (HVAP) instead of 25mm autocannons. These guns are meant for taking out heavier armroed vehicles that the original FSV variant cannot defeat. The FSV-H can also be used like a Tank Destroyer, but they are usually atatched to LTV-22 units like the FSV. Manufacture of Heavy variants are less compared to the original FSV due to the drawbacks it has. The LTV-22 platform is simply not optimized for the dual 90mm. Although it can perform exceptionlly well, in the long run, it requires more maintenance.

During the first invasion of Nawa IV, Procyon forces suffered numerous casualties from mines and IEDs. Engineers in the frontlines had to come up with a quick solution, and this solution was in the form of the LTV-22 ABV. The ABV stands for "Assault Breacher Vehicle". It's primary role is to clear minefields using a line charge. The ABV variant is equipped with a mine plow for clearing mines, a turret equipped with 4 line breacher charges. This variant can carry 4 personnel, a driver and 3 passengers. The passangers are usually Combat Engineers, but some ABV vehicles carry a small fire team of 3

A retro-fitted LTV-22 designed to transport the wounded out of battle. To make room for stretchers, the side armor had been reduced. However, armored skirts on the side are added to compensate for this. The MEDIVAC has 3 stretches for the wounded, and can carry 2 medics at any given time.

Procyon forces realized that the Line Breaching charge system on the ABV variant could be used more offensively, the AT (Anti-Tank) variant is a modified version of the ABV Variant. The LTV-22 AT is equipped with 4x ready-to-fire 150mm HEAT missiles with 6 reloads. 

FSV: 25mm Autocannon (Armor Piercing + High Explosive Incendiary)
FSV-H: 90mm rifled cannon (High Velocity Armor Piercing)
ABV: Line breaching charge
AT: 150mm High Explosive Anti-Tank Missile

The Invasion of Aki - Caught the Imperial Kazek by surprise, the Procyon 12th Assault Force despite being outnumbered was able to inflict significant damage to the Imperial Kazek Army stationed at the Aki plains. During the initial engagement, the Imperial Kazek lost;
19 Battle Tanks
9 Artillery pieces / Self Propelled Guns
25 Other Armored Fighting Vehicles
Estimated: ~300-350 killed 

Procyon 12th Assault Force casualties;
1 LTV-22 AT
4 LTV-22 FSV
1 LTV-22 FSV-H
14 killed, 31 Injured

The Battle of Nawa II - A Procyon unit consisting of; 12 LTV-22, 5 LTV-22 FSV, 3 LTV-22 FSV-H, 2 LTV-22 AT and 82 Personnel heading for the frontlines was intercepted by a large Imperial Kazek Army battlegroup attempting to cut off the Procyon frontlines from their main force. The small LTV unit was tasked to hold off the Imperial Kazek until reinforcements arrive. After reinforcements arrive, only 7 personnel that retreated into a nearby forest survived the battle. Although the rest were killed, the unit was able to hold off the Imperial battlegroup just long enough for the Procyon frontlines to be notified and prepare their defenses. 

Credits to owners


The LTV-22 was based/influenced on the M113 APC


The ABV/AT variant is influenced from the BMPT Terminator