Military grade is a fashion statement by the marketing departments nothing more. ford and their military grade aluminum, wires now military grade all marketing hype. Mil spec is usually attached by military buyers for reasons specific to the needs of the requirements like hardening, shock resistance durability never have I seen it attached to quality other then for specific issues like impurities for corrosion prevention etc. I've been a Navy submariner for 21 years and every time I see an add for military grade I think how many people are getting burned from the marketing hype.
Military grade in no way means better. as helomech stated