If you search for information on Carl Koch, you will see that he has an entry on sites that tell the story of the Monuments, Fine Arts, and Archives program (MFAA), also known as the Monuments Men. While there is solid evidence that Koch was trying to get in the program, I have not found anything to indicate that he served in any capacity in the MFAA.
It seems that the program pulled mostly from qualified personnel in the US Army but in 1944-45 they extended it with an effort to bring on members from the US Navy. At the time, Lt. Carl Koch was stationed in Hollywood, Florida and was actively corresponding with his contacts at Harvard who were part of the selection committee for the program. He was certainly qualified and was recommended for the MFAA by multiple people even being first on one of the lists submitted.
This information is all available through Fold3, the military records offshoot of Ancestry.com. Among the documents related to Koch’s MFAA application is his resume. This is significant for two reasons. The first is that it is typed on Planning & Building Associates letterhead. (Maybe a topic for a future post). The second is that it is the only record I have seen that clearly states what Koch’s work experience was prior to his development of Conantum and then Techbuilt Inc.. This type of information is found in an architect’s AIA application for membership and/or fellowship. However, Carl Koch’s AIA records, along with many others, were damaged in storage and lost.