On October 17, 1918, the First World War was almost over. That day’s edition of the Toronto Daily Star contained this ad for Klim milk powder:
“Klim”, by the way, is “milk” spelled backwards.
According to Wikipedia, Klim was developed for use in the tropics, where milk tended to spoil quickly. During World War II, it was issued as part of the U.S. Army’s jungle ration, and was issued by the Red Cross to prisoners of war. Flattened Klim cans helped Allied prisoners escape from Stalag Luft III.