After a successful collegiate career during which he became the first Notre Dame runner to break the four-minute mile barrier, he went on to run at an international level throughout the 1980s.

In February 1981, as a senior undergrad, Aragon ran the indoor mile in a competitive meet in Champaign, Illinois, during which he managed to kick ahead of John Gregorek right before the end of the race.

[3] After graduating from Notre Dame in 1981, Aragon continued training and was called up to run for the United States at the 1983 Pan American Games.

He qualified for the 1984 Olympic Trials for the men's 1500, which involved a loaded field including Steve Scott, Jim Spivey, and Sydney Maree.

Aragon's last major international appearance was at the 1987 World Championships in Athletics, where he ran in the men's 1500 but did not make it the finals.