Lockheed Martin Corp.’s (LMT) shares surged an impressive 23.6% in the year-to-date period, outperforming the Zacks Aerospace-Defense industry, the broader Zacks Aerospace sector and the S&P 500. As the largest defense contractor in the United States, Lockheed rides on its solid presence in both domestic and international defense space, innovative products in the pipeline as well as a solid financial position.A similar stellar performance has been offered by other defense players, such as RTX Corp. (RTX) , ...