The grades of three aerospace and defense stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

This week, Kratos Defense & Security Solutions, Inc. (KTOS) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). Kratos Defense & Security Solutions operates as a defense contractor and security systems integrator for the federal government and for state and local agencies. In Portfolio Grader’s specific subcategory of Earnings Momentum, KTOS also gets an A. For more information, get Portfolio Grader’s complete analysis of KTOS stock.

Elbit Systems Ltd (ESLT) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Elbit Systems engages in the design, development, manufacture, and integration of defense systems and products worldwide. For more information, get Portfolio Grader’s complete analysis of ESLT stock.

This week, Exelis Inc. (XLS) pushes up from a B to an A rating. Exelis provides command, control, communications, computers, intelligence, and surveillance and reconnaissance (C4ISR) related products and systems in the United States and internationally. For more information, get Portfolio Grader’s complete analysis of XLS stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.