The Korean War Memorial is part of the Pima County Kino Veterans Memorial Sportspark & Centers, Ajo Way & Forgeus Avenue. It's well worth a visit! I discovered the memorial in December of last year.
(That's a flower at the bottom right of the last photo.)
You can read more about the memorial in the June 23, 2000 Tucson Citizen article Korea’s dead get their due.
Update (January 13, 2014): There's a photo of flags at the memorial in the Tucson's Pocket Parks blog on the page Korean War Memorial (click there to see it).