"...To assist customers in ensuring that packages are delivered in time, the Military Postal Service Agency has released its annual recommended mail-by dates for theaters around the world. These dates are just guidelines, however, and people should carefully consider which type of mail service to use when they arrange shipments..."
Reference: Stars and Stripes
Back in Time | QSO/QSL Card of Roy A. Whistle; 1st LT USAF
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Article Title: QSO/QSL Card of Roy A. Whistle; 1st LT USAF Reference
Source: w5vby.blogspot.com