The disarming of the U.S. after WW I would have not been taken to an extreme and the Army would have stayed somewhat larger than in OTL. Also Pershing, after leaving the Presidency, would have spoken out about the danger of a resurgent Germany and might have given Roosevelt enough support to begin rearmament sooner. Pershing knew that the way the Great War ended guaranteed a replay; he, unlike the European Allies (and the fool Wilson--America's worst president), wanted to march through and occupy Germany to let them know they'd been thoroughly defeated. The problem with all this is that Pershing may not have had the political skills to win the Presidency or, if he did win it, to exercise the powers of the office effectively.