I think you’re “off” by a year, possibly two years. In 1969, they were still sending guys to ‘Nam in large numbers. In the summer of either ‘70 or ‘71, my number came up, and I had to report for my Draft Physical.
They found that I had high blood pressure, but just to make sure that I wasn’t “faking it” (??) , I was given a form that my doctor had to fill out after taking and recording my blood pressure for 3 consecutive days. When my Hypertension was confirmed, I received a 4F classification.
EDIT It was definitely the summer of 1971, because I was enrolled in Graduate School that summer, and remember that I had to fit-in those MD visits with my class schedule.