U.S. Air Force Staff Sgt. Cody Brown, right, with the 436th Aerial Port Squadron, checks pallets of 155 mm shells ultimately bound for Ukraine, April 29, 2022, at Dover Air Force Base, Del. U.S. officials say that as Russia’s war on Ukraine drags on, U.S. security assistance is shifting to a longer-term campaign that will likely keep more American military troops in Europe into the future. They say a new aid package to be announced includes an additional roughly $3 billion to train and equip Ukrainian forces to fight for years to come. (AP Photo/Alex Brandon, File)