The 19th century term describes the perceived right of Americans to use force or the threat of force to wrest desireable land from the grasp of others.
The shipment is the first in an operation that U.S. military officials anticipate could scale up to 150 truckloads a day entering the Gaza Strip as Israel presses in on the southern city of Rafah.
Secretary of State Antony Blinken made an unannounced visit to Kyiv and said some new U.S. aid already arrived and more will reach the battlefield in the coming weeks.
Forecasters warned a wave of dangerous storms in the U.S. could march through parts of the South early Thursday, after deadly storms a day earlier spawned damaging tornadoes and massive hail.
The shipment was supposed to be 1,800 2,000-pound bombs and 1,700 500-pound bombs, according to an official, with the U.S. concern being how the explosives could be used in a dense urban setting.
Thieves apparently killed the three, who were on a surfing trip to Mexico's Baja peninsula, to steal their truck because they wanted the tires, Mexican authorities said.
Five of the 31 tanks have already been lost to Russian attacks in Ukraine, where the use of surveillance and hunter-killer drones had made it difficult for them to operate.
Okinawa, which sits closer to China than to Japan's main islands, is the focus of U.S. and Japanese efforts to beef up defenses in Japan's southwest islands.
U.S. Treasury Secretary Janet Yellen met Sunday in Beijing with Chinese Premier Li Qiang and sent a message of mutual cooperation despite the nations' differences.