President Donald Trump signed an executive order on Monday aimed at boosting domestic suppliers of defense contractors. The directive became the latest action from the administration to reduce dependency on overseas supply chains, tightening waiver rules that allowed contractors to use cheaper or easier options in purchasing materials from China and other foreign suppliers. “The United States military is the most effective and powerful fighting force on the planet,” Trump’s order read. “It is the policy of the United States that not only the finished equipment deployed by our military, but also the critical materials and components necessary to manufacture, maintain, sustain, and repair that equipment, are sourced domestically or from allied nations.”...