The M-1941 Mounted Canteen Cover was authorized for issue on the scale of one per man in following units: all mounted troops, dismounted cavalry, howitzer sections, infantry cannon companies, 105mm self-propelled gun units, and enlisted ranks in Armored Command, The dismounted cover was issued to all other units and individuals.
Reference: 《American Web Equipment 1910-1967》
Stock Number Reference:
Cover, Canteen, Mounted, M-1941
Army Stock Number: 74-C-304
Strap, Suspension, Cover, Canteen, Mounted, M-1941
Army Stock Number: 74-S-371