Final answer:
The USO awarded the DCC with the Spirit of Hope Award in 1991, in honor of their service to the United States and the Armed Forces.
Step-by-step explanation:
The award that the USO presented the DCC with in 1991 was the Spirit of Hope Award. This award is named in honor of Bob Hope and recognizes individuals or organizations for their service to the United States and the Armed Forces. While the information provided about General George Marshall awarding Frank Capra the Distinguished Service Cross in 1945 and Jimmy Stewart receiving the French Croix de Guerre is interesting historical context, it does not pertain directly to the USO or the award in question regarding the DCC in 1991.