Here's the other side of my story! Due to my Air Force Service in Intelligence, I had Travel Restrictions relative to my Security Clearance for 10 years after I left in 63". I could not travel over 50 Miles into Either Canada or Mexico! Now it would of made more sense to not be allowed to leave the Country Period!
In 1972 the Family made a trip to Canada and we planned a Loop trip from Vancouver and back via Hope, Chillwack, Kamloops Etc. Well over 50 miles into CA. I really hadn't thought about the restriction in years.
We get to the Border and the CA Agent inquires as to our destinations and I replied with a brief Itinary. He looks at me after punching his Computer for a brief time and replies, "That's a bit farther than 50 miles from the Border!" I was stunnded! He then asked where we were headed that Night I replied, "North Vancouver!" He responded," Enjoy your Vacation, SIR!"