Here's another odd callsign, COST46: https://globe.adsbexchange.com/?icao=ae0416
"The E-6B Mercury is a dual-mission aircraft capable of fulfilling either the TACAMO ("Take Charge and Move Out") mission or the airborne strategic command post mission and is equipped with an airborne launch control system (ALCS). TACAMO links the NCA (National Command Authority) with naval ballistic missile forces during times of crisis. The ALCS is capable of launching U.S. land based intercontinental ballistic missiles."
Here's another odd callsign, COST46: https://globe.adsbexchange.com/?icao=ae0416
"The E-6B Mercury is a dual-mission aircraft capable of fulfilling either the TACAMO ("Take Charge and Move Out") mission or the airborne strategic command post mission and is equipped with an airborne launch control system (ALCS). TACAMO links the NCA (National Command Authority) with naval ballistic missile forces during times of crisis. The ALCS is capable of launching U.S. land based intercontinental ballistic missiles."