What is TACAMO? The data below comes from Wikipedia:
TACAMO (Take Charge and Move Out) is a United States military system of survivable communications links designed to be used in nuclear warfare to maintain communications between the decision-makers (the National Command Authority) and the triad of strategic nuclear weapon nuclear weapons delivery systems. Its primary mission is serving as a signals relay, where it receives orders from a command plane such as Operation Looking Glass, and verifies and retransmits their Emergency Action Messages (EAMs) to US strategic forces. As it is a dedicated communications post, it features 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, minimizing the likelihood an emergency message will be jammed by the enemy. This airborne communications capability largely replaced the land-based extremely low frequency (ELF) broadcast sites which became vulnerable to nuclear strike.
One current version of the TACAMO is the replacement mission for the SAC 24/7 Looking Glass mission that maintained the worldwide NCA link. The Navy now maintains and flies the aircraft for the mission. They are a continuation of the mission begun in the early 60s but is no longer 24/7.