I found the footage in the US National Archives' digitised collection when doing some research. It was filmed in April 1918 by the US Army Signal Corps. Thanks again for all your support! Be sure to check out our accompanying article for this video for more information here - https://armourersbench.com Footage source: https://catalog.archives.gov/id/24667 Music source: shorturl.at/kwMQ4 If you enjoy our work please consider supporting us via Patreon, TAB is a viewer supported channel and any help is very much appreciated! We have some great new perks, check out our Patreon page here: https://www.patreon.com/thearmourersbench You can also now support us with one-time donations via https://ko-fi.com/armourersbench Ever wished all the best gun history content creators were gathered in one place? Check out - https://surplused.com - we're on there! Where to find TAB: https://armourersbench.com https://facebook.com/armourersbench https://ko-fi.com/armourersbench https://www.patreon.com/thearmourersbench https://www.instagram.com/armourersbench https://imgur.com/user/ArmourersBench https://discord.gg/DAjRSBc