Even after a share-price liftoff, Lockheed Martin stock still has rocket fuel in the tank.In light of conflicts in the Middle East and Ukraine, one might assume that aerospace/defense giant Lockheed Martin (LMT 0.65%) would be a darling on Wall Street. Yet, Lockheed Martin stock gained little ground in 2024's first half.Then July came around, and suddenly Lockheed Martin stock's trajectory went from horizontal to vertical. This raises the question of "Is it too late to invest?" and, just as importantly, "Wh ...