Great list. I posted a MKII grenade a few days ago that I needed an ID for the manufacturer--AA. This list identifies that manufacturer as Alcan Aluminum Corp. (AAC). AAC was formed in 1965 by Alcan Aluminun, Ltd. (AAL) as a subsidary. Both are Canadian entities. So,whether AAC (not likely) or AAL, formed in 1928, did the US use a Canadian firm to manufacture US MK2 grenade bodies in WW2?