An odd way to describe a CPU. What makes them "military-grade"? Ability to perform math (and, therefore, "military-grade encryption" - this is a standard for eq

An odd way to describe a CPU. What makes them "military-grade"? Ability to perform math (and, therefore, "military-grade encryption" - this is a standard for equipment imports that China has applied in the past)? Or is there something else in the design specs, like EMP hardening or the like (but then, are AMD/Intel ones which were being considered so hardened? I admit to being a bit far from that problem space, so perhaps there are such things). Just seems... an odd descriptor without further explanation.