Silo network security codes

Silo network security codes is a keycard in the Fallout: New Vegas add-on Lonesome Road.

Location
It can be found in Base Commander Martin Retslaf's desk in an office on the second floor of the Hopeville missile silo.

Behind the scenes

 * The transcript for this note is exactly the same as the transcript for the Fort Constantine launch codes appearing in Fallout 3, and as a result mentions Fort Constantine rather than the Hopeville Ballistic Defense Station.
 * In reality, the launch codes for America's Minuteman ICBM's were 12 zeros up until the 1970s when the government made the air force provide "real" launch codes.