Military infrastructure isn't always as well-engineered as it should be all the time. It can be very costly and time consuming to deploy new encryption keys, especially for technologies like radios. It's not as simple as deploying a configuration file or running `ssh-keygen` and publishing a few artifacts. Many devices need to be rekeyed by hand, which can be labor intensive depending on the size of the inventory. Additionally, sometimes new hardware needs to be hand-delivered to the appropriate organizations for keys to function.
