Interesting note about the organ. They were originally made for missionary work pre-WW2. (at a Vermont organ company).
The Army saw them and figured if they worked in darkest africa they would work in the field.
Reed Organs also know as Pump Organs were used by missionaries in the Western US before WWI. Pump organs were also used by Chaplains in Europe during WWI although they were not official issue items. The military took many of these and covered them with green, blue, and gray paint. The company that supplied them was Estey in VT. But they were replaced by Lo Duca and they were used even in Vietnam. The elements of the jungle was very hard them. I am in the process of restoring a Lo Duca now.
Here is a picture of a Lo Duca in Vietnam. Notice the look on Billy Graham. He has a look like...what is that thing doing here in the jungle.