Can't compare with the tanks and guns but there are a few museums in the US that may be worth a visit. The Evergreen Aviation & Space Museum located in McMinnville, Oregon has the Spruce Goose as the main exhibit but also has loads of other stuff worth a look if you like things with wings. Another is the Castle Air museum in California which was fascinating because of some of the big post war bombers on display - some of those are BIG. The South Dakota Air and Space Museum near Rapid City was pretty good too with a few unusual exhibits and you can also get a tour of the USAF base where Rockwell B-1 Lancers are based and we saw a few flying from there (albeit from a distance). The final one, back in Oregon is the Tillamook Air Museum which has a few interesting aircraft but the we found fascinating was the blimp hanger it is housed in which is made from local wood.