In November 1973, McDonalds built its first Sierra Vista location adjacent to one of the largest military posts in the United States. While a significant number of its patrons were soldiers stationed at Fort Huachuca, by 1974 a new U.S. Army regulation governing uniform decorum prohibited soldiers from entering local businesses while wearing their fatigues. The fast food chain responded by opening its first in the nation drive-thru window at this location on Jan. 24,1975, thus giving Sierra Vista a place in international history.At first I thought, 1975? That wasn't so long ago... oh, wait... and as many of us do, I remember the older way of eating the car -- park, talk into the mouth, or wait until the wait staff came to the to take the order. Then the food would come, tray would hang on the rolled down window, and the glove compartment (box, my ass) door would fold open to hold drinks. I'm glad there's still a Dog 'n' Suds within moderate driving distance.