In 1937, the Army guarded the first shipments of a critical resource, U.S. gold, as it was transferred into Fort Knox. Nearly 90 years later, Washington faces a similar situation with a very different resource. The Army picked REalloys (NASDAQ: ALOY) to build a facility to process dysprosium and terbium at Utah’s Tooele Army Depot - two rare earths that keep high-performance magnets working in weapons, radar, sonar and electric motors. Gold went to Fort Knox because America was unsure they could protect it from threats abroad. Rare earths…