While looking over the exhibits on Virtual Stampex, I noticed two exhibits of military postal history:

https://www.abps.org.uk/competitions/wwi-influence-on-austro-hungarian-postal-operations/

WWI Influence on Austro-Hungarian Postal Operations

and,

https://www.abps.org.uk/competitions/field-post-systems-on-czechoslovak-territory-october-1918-to-february-1919/

Field Post Systems on Czechoslovak Territory October 1918 to February 1919

by Mr Lubor Kunc

Exhibits courtesy of: Association of British Philatelic Societies

https://www.abps.org.uk/

Welcome to the ABPS – the Voice of British Philately

MPHS members are encouraged to visit these websites.

[Bob Swanson]