The M-1 (or M-59) was a standard issue gas mask for Croatia (Yugoslavia) troops. It is a copy of the U.S. M-9 gas mask. It was also used by the Iraqi army in the Gulf War, where it was designated M-59. It is O.D green colored, and has a side-loading canister which uses a 60mm opening. The M-1 is not very common in the United States, as few were imported as surplus. M1 service used in World War Two