A search of Ancestry.com indicated several hits in military records for Jurgen which was not surprising. One struck my attention because Jurgen was born in 1903/1904. The reference indicated Jurgen had a muster date of December 1913 in the Marines. I knew my uncle was in the Marines, but the muster year of 1913 would have to imply there was yet another Jurgen.
Ancestry.com's results screen has a link for "View Original Image." I'm not certain that term is really correct, but that's a blog post for another day.