... having the third leg of the Nuclear Triad being hard to find atomic powered nuclear missile firing submarines is a great idea. But calling them on the phone and telling them to blow up the bad-guys is hard because they are hiding under hundreds of feet of ocean.
Enter TACAMO (Take Charge and Move Out). This is an airborne system using trailing wire antennas that are miles in length. These antennas can emit very powerful, very long frequency radio signals which can be received all over the world and deep under the ocean.
The first image is of the modified Boeing 707 aircraft in use today. Lower diagram is from the C-130 Hercules that were originally used for the mission. This is a chiefly US Navy system- but I believe it is in redundancy with other strategic forces.
In a world of rather dull military acronyms- here is one that really stands out! Could it have been the product of a drunken Admiral at a staff Christmas Party?