Earth's National Security ordering a "Permanent Freeze" on Project Metal Black.
The Earth's National Security order #033944 called "Project Metal Black" was the result of the discovery of the Newalone, the energy source used by the alien invaders to power up their beam weapons.
This project was focused on developing at least 20,000 human space craft capable of wielding the same beam-weaponry as the aliens. The space craft was known as the CF-345 Black Fly, named by its method of Newalone energy use.
In 2052, when the remaining diplomats passed a treaty on to the aliens under a peaceful surrender, they also declared a Permanent Freeze on Metal Black, but as the population and resources on Earth were drastically reduced, it was only a matter of time until somebody found this project and the Black Fly and launched a counter attack.