The other day I passed by the buildings of the 6174th Garrison[sup]*[/sup] which made me wonder, are there actually 6000 similar units around the country (US)?
Which leads to the larger question, how are ordinal numbers assigned for military units?
I know, for example, we don’t currently field 101 airborne divisions, or even that many divisions of any kind, but the 101st is a well-known unit. Are the intervening numbers for inactive units, or has every number been historically assigned, with some numbers being abandoned (so that there have been a total of 101 or more divisions)?
Or is it a regional/functional designation? Or just whatever gets chosen?
Related questions - at what unit level are ordinal numbers used, and at what level are letters used? Is there a ‘scope’ of number usage at a certain unit level (such that every division could have a 3rd Brigade, and every brigade could have a 1st Battalion?)
This is a US-centric question, but I’m curious to hear what methods other countries use, so jump in if you like.
[sup]*[/sup]not the actual number.