Thank you for the photo scans!

                                   Poston Subjugation crew

                                   Poston Camp 1 Lifeguards
                                   Photo credit: Kenji Shiosaki Collection

                                 Poston Relocation Office Staff  
                                     Photo credit: Ed Nossoff Collection

                                     Photo credit: Kenji Shiosaki Collection

L A Times Photos

                        Looks like a refreshments served at a party or dance

 "June 6, 1943: Los Angeles Times staff photographer George Watson and staff representative Chester G. Hanson take a tour of the Poston War Relocation Center."          

Source:  http://framework.latimes.com/2012/05/11/japanese-internment-poston/#/0