As I understand the phrase, 'affirmative action' is an endorsement in the form of political or military support. The benefits are to the party that embarks on a path of action. An obvious example is the course taken by Tony Blair against Saddam Hussein, when he suspected the Iraqis of hiding 'weapons of mass destruction', in support of George Bush's stance on militant Islamic terrorism. He suspected Saddam of harbouring Al Qaeda leaders; he also suspected the Iraqi regime of funding terrorism. Throwing caution to the wind Blair 'jumped in with both feet' and the fallout was the death of a prominent scientist and weapons inspector, David Kelly. Suicide was spoken of but darker shadows loomed on Blair's horizon. So keen was the PM to undertake supportive action to Bush that he elbowed his way through any opposition at Westminster. True to his intention to take Saddam to task, Blair sent in the military. There was a negative side to this kind of support, in that his political career took a nose-dive and he was branded 'Bliar'.
Contrast this with 50 years earlier, when President Roosevelt did his level best to get Congress behind Churchill, sidelining Nazi sympathies in the U.S, with Lend-Lease. It was only after Pearl Harbor was attacked in December, '41 that Roosevelt could put his resources to supporting the allies in Europe as well as taking on the Japanese in the Pacific.
Further, Stalin wanted his western allies to open a second front in Europe to 'take the heat' away from his own beleaguered forces. Although indirectly affecting the Germans' strategy - for such Hitler's political and ideological machinations were meant to be - American and British action in North Africa led to the invasion on the 'soft underbelly of Europe'. namely Italy. Directly, D-Day took German attention from the Russians in the east for a short time, but their main fear still was of being over-run by the Russians and they only reduced their manpower in the east in December, 1944 to mount the Ardennes offensive. Affirmative action was really tested in he Allies' response to the German offensive in Belgium when, after Christmas, Patton's group suddenly appeared on the German flank. That put paid to any hope of a German 'final victory'.