* United Kingdom
* France
* Russian Empire (until March 1918)
* Italy (from May 1915)
* United States (from April 1917)
* Japan
* Belgium
* Serbia
* Montenegro
* Romania (from August 1916)
* Greece (from November 1916)
* Portugal
* Brazil (from October 1917)
* China (from August 1917)
* Cuba (from April 1917)
* Panama (from April 1917)
* Liberia (from August 1917)
* Siam (from July 1917)
* Costa Rica (from May 1918)
* Guatemala (from April 1918)
* Haiti (from July 1918)
* Honduras (from July 1918)
* Nicaragua (from May 1918)
* Peru (from April 1917)
* Uruguay (from October 1917)
* Ecuador (from December 1917)
* Bolivia (from April 1918)
* Dominican Republic (from June 1918)
* Armenia
* Czechoslovakia
* Georgia (from May 1918)