Since America ended the draft, the military has had to recruit. Like any good advertiser, they've learned how to couch their message in the style and medium of teen culture. Today, they produce video games where you can fly combat aircraft. In 1979, their target audience wore bell bottoms and rode Harleys. And in that more innocent time, the selling point could still be the path to an affordable college education that the Army could provide.
Army National Guard ad, November 1979, from Currents Events magazine
Army ad, December 1979, from Scholastic Search magazine