My son has received appointments to both USNA and USAFA. USNA offer of appointment arrived very well presented with a certificate from the Superintendent. This is a wonderful keepsake regardless of his decision. USAFA offer is an electronic link to a letter signed by the Director of Admissions. A similar certificate from USAFA is only sent to those "accepting" offers. It's not really a big deal because it is only superficial, but when choosing between two very similar institutions sometimes little things like this stand out to a candidate.