From Wikipedia, a story of color-coding gone horribly wrong in Afghanistan,
HDRs (Humanitarian Daily Rations) are typically air-dropped into the disaster area on large pallets. The HDRs initially dropped in Afghanistan were yellow, before it was realized that the packages were the same color, and approximately the same size, as American cluster bombs, which were also dropped in Afghanistan.[1] Later packages were made in an orange-pink color described as “salmon“.[3]
(Emphasis mine, some links altered, perminant link to the quoted Wikipedia revision.)
I’ve written before about pitfalls of color coding.