Both of these defense stalwarts have strong bull arguments right now.As tensions continue to run high in multiple areas around the globe, the goods and services of defense companies will, undoubtedly, remain in high demand.Of the many choices, two common considerations that are often found on the radars of those seeking a defense investment are RTX (RTX 0.67%) and Lockheed Martin (LMT 0.41%). Let's see how two fool.com contributors break down the bull cases for each stock.This aerospace and defense giant's ...