Periodically discussions come up here about the desirability of CR123 versus AA batteries from an availability point of view. It is often noted that because the military is able to control its own supply channel, military users don't perceive any downside related to the availability of CR123 batteries.
But I've noticed something interesting recently. L-3 EOTech, a maker of combat optics for the US military, has been introducing new models at the specific request of the US military that differ from old models only in that the take AA batteries instead of CR123.
Just an observation...