I used to wrestle with this because my still-relevant military experience fell farther and farther into my past employment history. Eventually, it (and several subsequent stints of employment) became a single line. Before I left employment for the weirdness of self-employment, I had both a traditional 2-page resume and a 1-page "brochure." Neither ever seemed to make a ripple with whomever I sent it to. I guess I didn't have the right stuff.