https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-frc3/38964_122703417777084_504637_n.jpg?lvh=1
Camp Red Cloud, Uijongbu, South Korea APO AP 96258
It is a Japanese 105mm Type-91 (1931). These were not in WW1 service. Here is a photo of one that is a bit more complete:
http://warmemorials.us/artillery/type91_105mm_menasha.html
and a short article:
http://simple.wikipedia.org/wiki/Type_91_105_mm_howitzer
R/
Ralph Lovett