In modern parlance, it's not munitions at all. But yes, Antheil and Lamarr's proposed device was trying to hide the signal so that it would be harder to jam by

In modern parlance, it's not munitions at all. But yes, Antheil and Lamarr's proposed device was trying to hide the signal so that it would be harder to jam by hopping along one of 88 frequencies which were marked in the piano roll. This is a form of cryptography. Any algorithm meant to authenticate, sign, or hide information is cryptography, and any attempt to break such techniques is cryptanalysis. Currently we do not like to think of cryptography as munitions due to the crypto wars of the 90s. But however you fall on that debate of whether cryptography is munitions, it is misleading to consider someone volunteering their time in an unprofessional capacity to send an unsolicited patent to the Navy, which the Navy rejected, as being equal to working in "munitions research"