Final answer:
The provided materials do not contain information relevant to how DFM solved their office expenses issue after 1971, making it impossible to give a correct response.
Step-by-step explanation:
The question seems to be asking about how an organization named DFM addressed its financial challenges regarding office expenses after 1971. However, based on the information provided which discusses the growth of the U.S. federal budget and various international aid efforts, there's no clear connection to the specific issue of how the organization DFM solved its office expenses problem. This disconnection indicates that the provided reference materials are unrelated to the given question about DFM. Without exact details on DFM and its strategies post-1971, it is not possible to provide an accurate answer to how they solved their office expenses problem.