My Dad brought this home from his time in the Pacific in WW II.

Might be something organic inside. Try a little vinegar and let it sit. Drain it, Rinse with water. it should work loose.   Also, try a little water and dishwasher machine granulated soap inside the canteen. Swishing it around will clean it out gently.

Fill the canteen with ice cold water so it will slightly contract.  Then, heat the exterior of the canteen cup so that it will expand and loosen.   Charlie

I recently acquired a pre-WWI M1910 undated canteen, but it is stuck firmly inside the drinking cup. Does anyone have any suggestions for removing it that doesn’t involve blunt force, as I don’t want to damage them? Any help is appreciated!

That is very cool!  I don't think many high schools today would look favorably on having a Pack Howitzer hanging around the campus.   Here is a pre-war pic of a "traveling" Pack Howitzer.  (Photo credit to Handcartz.)   Regard, Charlie    

Thank you for the input!! That’s such great information. Here is a photo of one of the tags on his green aviation uniform. Name is H.C. Baldwin and that’s all I know! I haven’t been able to find out anything else even after scrubbing the national archives for all Baldwins. Any advice? 

Those are pretty cool uniforms! The green and khaki are aviation uniforms. With the setting up of the Naval Aircraft Factory and other WW1 responsibilities, it was decided to train some Construction Corps officers in aeronautical engineering, and a few were sent to Pensacola for flight school.   At the time the Construction Corps were the "brains" of the navy, selected from the top of their Academy class to go on to grad school at MIT or another elite university.

Hi there! Very cool uniforms! What was his name? Wade

I have 3 different uniforms belonging to the same Navy officer. From what I’ve researched, I gather that he was an ensign in the construction corps pre-1918. However I have never seen this tan uniform. I wonder if it is pre-WWI and am looking for thoughts and opinions on the matter! Thanks!

It seems GENSCO & AMCRAFT were connected in someway, Both use a similar style acronyms for the company names Both using the same Number system and AMCRAFT being SOLD in a GEMSCO Catalog Maybe Gemsco purchased AMCRAFT early on at some point