Without more information about Avery Green, it's not possible to answer this question. Many men with that name enlisted, from many countries. You have to at least narrow down which country Mr. Green was from to make the search a bit easier.
World War 1, World War 2, Indian Independence, Green Revolution, Bhangra,
America :)
Red Blue Green
Florence Green
William Avery "Billy" Bishop
hgokfu6df green koala
green ones and pink ones
Green Meadow
Brown/Baige Dark Green I Think
dark green with a star in the right of his chest
The most common one that was used as a weapon in World War 1 is called the Artillery
millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1 millions died in world war 1