[throwaway81523]

> I recall surprise upon learning for the first time that the USPS has its own law enforcement agency

As someone put it to me a while ago, "the US military is so big that not only does its navy have its own army, but its navy's army's air force is the 8th largest in the world."[1]

[1] US Navy's army = US Marine corps; navy's army's air force = USMC Aviation, https://en.wikipedia.org/wiki/United_States_Marine_Corps_Avi... .

[slapfrog]

Related factoid; the US Navy is the world's second largest air force.. second only to the US Air Force itself. And if you split Alaska in two, Texas would be the third largest state.