China's grip on global-market for rare-earth metals gives it the ability to target American-weaponry in its trade war with U.S. Everything from Lockheed Martin Corp.'s F-35 Joint Strike-Fighter-jet to guided missiles and lasers used to determine targets rely on the elements to perform key functions. China accounts for as-much-as 95% of global output and U.S. relies on Asian-nation for 80% of its rare-earths requirement.