What is "tacamo"

TACAMO (Take Charge and Move Out) is a U.S. military system of survivable communications links designed to be used in nuclear war to maintain communications between the decision makers (the National Command Authority) and the triad of strategic nuclear weapon delivery systems. Its primary mission is to receive, verify and retransmit Emergency Action Messages (EAMs) to US strategic forces. It does this by maintaining the ability to communicate on virtually every radio frequency band from very low frequency (VLF) up through super high frequency (SHF) using a variety of modulations, encryptions and networks. This airborne communications capability largely replaced the land based extremely low frequency (ELF) broadcast sites that became vulnerable to nuclear strike.