Equipment sent was probably welcome
The most important aid from the United States were the (1) Willys Jeeps and (2) Studebaker US6 trucks.
We received 50,000 Jeeps, and 150,000 Studebaker trucks.
The Jeeps were used for command, reconnaissance, and medevac.
The Studebakers were crucial to logistics, able to lift 2.5 tons.
Without the Jeeps and trucks the Red Army would have advanced much more slowly.
But that's probably the most impactful aid received. The other important items were locomotives, rail cars, boots, canned food, uniforms, and pharmaceuticals (penicillin, morphine, etc).
As far as tanks, guns, planes, armored cars, small arms, and munitions were concerned - not a meaningful fraction proportional to Soviet domestic production.
Still - Russians still call all SUV's "Jeeps". Companies like John Deere and Caterpillar still have massive respect.
People still remember American SPAM, and now Russians eat SPAM too.
The help was enormous, and was most appreciated. But did it decide the war? I don't think so - here I would agree with Barney.
Without US help, the war would have still ended in a Russian victory, but likely closer to 1946-1947 - and with significantly higher casualties.
The reason I argue this, is because the German war machine broke under Moscow long before US help started arriving in mass quantities.
The Germans miscalculated big time - they thought (as Hitler said) that they would kick down the door, and the whole house would come crashing down. When the house did not collapse, that's when the Germans should have already known they were cooked. You can't knockout a country like Russia, in the same way you can France.
