When nations go to war, the military-industrial complex springs into action. Relatively obscure tungsten is often on the front lines.A combination of tight supply, Chinese export restrictions, and heavy demand from military spending, including the current war with Iran, has jolted tungsten prices by 557% since last February, a far bigger increase than commodity stars like gold, silver, copper or oil. The exceptionally hard, scarce metal withstands extreme temperatures, making it essential for applications ranging from lighting and electronics to…