Every callsign tells a story. Most of them involve coax.
COMMISSION'S RULES · Purpose and permissible use of the Amateur Radio Service; Operator/primary station license grant; Meanings of basic terms used in FCC rules; Interference; RACES rules; Phonetics; Frequency Coordinator; Beacon
What proves that the FCC has issued an operator/primary license grant?
When transmitting, each amateur station must have a control operator. The control operator must be a person:
(a) For whom an amateur operator/primary station license grant appears on the ULS consolidated licensee database, or
(b) Who is authorized for alien reciprocal operation by § 97.107 of this part.