The 15-cent airmail stamp (Scott C32) honoring the United States Army Caribbean School was issued on November 21, 1961. The school was located at Fort Gulick on the Atlantic side, and the first day ceremonies were held there. At the time the postage for an airmail letter to Latin America was fifteen cents, so it was widely used, and eventually all 560,000 copies were sold. The motif is the insignia worn by all members of the staff and faculty of the school, which trains Latin American military personnel in many subjects and in the Spanish language. In the background is a map of South and Central America without borders due to the sensitivities over the demarcation of borders between several of the countries. It is commonly referred to as 'The Army Caribbean School Stamp'.
Many first day covers in a variety of formats with Fort Gulick first day postmarks were prepared by different cachet artists. Non-philatelic usages are mainly to Latin America, often from students at the school, but other usages—normally in combination with different stamps—are also known, although none are common.
