Interplanetary Strategic Alliance

the Interplanetary Strategic Alliance or ISA for short is the main military force of the United Colonial Nations (UCN) and is the main protagonist of the Killzone franchise. The ISA is meant to protect human colonies and the UCN and enfore the UCN's will if ordered to.

Inauguration of the ISA
As human colonies expanded into many planets and star systems, the UCN began to notice a large gap of communication between both the UCN on earth and the Human Colonies in other systems. In response the ISA was created as a local military force for each colony but would unite to defend multiple colonies as a much larger military force. The UCN would provide training, equipment, and political support while the local cononial governments with funding and manpower. The ISA was to be both military and police forces for the human colonies and each local colonial government and authority would ultimatly report to UCN central command back on earth. In 2133 Alpha Centauri and Altair Systems became the first ISA command centers.

First Extrasolar War
During the colonization of Alpha Centauri, six colonial ships go missing leading to a massive finanical crisis for the UCN. the Helghan Corporation (HelgCorp.) soon colonized Helghan and the ISA colonized Vekta but the Helghan Corporation had massive amounts of money and refused to give some to the UCN and wanted to gain finaincial independnece due to laws and regulations the UCN had on space travel and trade. In response to the Helghan Corp's seccession threat, the ISA was sent in to prevent the Helghan Corp from leaving starting the First Extrasolar War in 2199. 5 years later in 2204 the war ended with a tactical ISA/UCN victory.

Blockade around Helghan and Rise of the Helgasts
After the Helghan Corporation was defeated, all human colonists with affiliation of the corporation fled to helghan. Helghan was a harsh desert world and the colonists were cut off due to the UCN forcing the ISA to block Helghan and cut off their supplies. the helghan Administration governed the planet but was corrupt and inefficient thus leading to the rise of Scolar Visari in 2347 and the creation of the Helghan Empire. The Helghast population began to become increasingly militaristic and under the leadership of Scolar Visari, the ISA was ordered to pull out due to the rising military dictatorship. 10 years kater in 2357 the Helghast Army launched a massive fullscale invasion of Vekta starting the Second Extrasolar War.

Helghast Invasion of Vekta
Following the rise of Scolar Visari as Autarch, the Helgast military had disabled the orbital defenses leaving the planet defensless in space. As helghast troops decended from above and landed and began their attack on Vekta, the ISA was soon deployed to prevent the planet from being taken over. The ISA forces were being oushed back at first as helghast forces had overwhelming numbers and most of the planet had already fallen. Despite odds against them however, the ISA had retaken the planet and the Helghasts were pushed back but a Red Dust nuclear bomb was stolen by them.

Military Structure
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