Naval Special Warfare Unit Four / NSWU-4 Homestead Florida SEAL Navy Challenge Coin Defense Contractor The serial numbered is shaded

The serial numbered is shaded out in the picture only

and a position for launching Stinger shoulder-fired SAMs

*new old-stock

it is the service cryptologic component (SCC) responsible to the National Security Agency and Central Security Service for Air Force cryptographic activities

Scandal and Trial information from Wikipedia:

Naval Special Warfare Unit Four / NSWU-4 Homestead Florida SEAL Navy Challenge Coin Defense Contractor The serial numbered is shadedThis coin is 1 3 4 inches in diameter. Naval Special Warfare Unit 4, was a geographical located SEAL unit stationed with the US Southern Command left Roosevelt Roads, Puerto Rico in 2003. Re activated in 2016 in Homestead, Florida.