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NASDA is the North American Strategic Defence Agency.
NASDA was formed in 2076 to defend North America from conventional and nuclear attack.
Construction of a satellite defence system began in 2081 and was completed in 2082.
In 2085, the NASDA satellites fired their nukes at earth.
There were also ground based sites. Many of these were destroyed in the nuclear counter-strikes, but there's bound to be some out there.
The NASDA satellites also contained pulse lasers designed to shoot down missiles approaching North America.
During the counter strikes, these LasSats failed to fire.
If brought in to operation, these LasSats could inflict major damage on ground targets.
All nukes targeted at North America found their targets.
We know that NEXUS is searching for NASDA Central in the Eastern sector. This was one of the land-based control centres for the satellites. If the centre is found intact, NEXUS may get control of the satellites.
NEXUS claimed that it had already destroyed the world...