| Title | Flight Surgeon |
| Start Date | 1959-00-00 |
| End Date | 1961-00-00 |
| Is Current | no |
| Notes | From 1959 to 1961, McDonald served as a flight surgeon in the United States Navy stationed at the Keflavík naval base in Iceland. He married an Icelandic national, Anna Tryggvadottir, with whom he eventually had three children. They divorced sometime before 1975 when he married for the 2nd time to Kathryn Jackson (1975–1983). |