AOP
In Remembrance 2023
This is the manual that covered Air Observation Posts (AOP) in the Artillery during WWII. It is pretty accurate from what I have found in other period accounts and documents.
View attachment 003218-fm-6-150-organic-field-artillery-air-observation-1944-19.pdf
View attachment 003218-fm-6-150-organic-field-artillery-air-observation-1944-19.pdf