The grades of four aerospace and defense stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

DigitalGlobe, Inc. (DGI) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. DigitalGlobe provides commercial earth imagery products and information services worldwide. In Portfolio Grader’s specific subcategory of Sales Growth, DGI also gets an A. For more information, get Portfolio Grader’s complete analysis of DGI stock.

This week, TASER International, Inc. (TASR) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Taser International develops, assembles, and markets less-lethal weapons for use in the law enforcement, private security, and personal defense markets. For more information, get Portfolio Grader’s complete analysis of TASR stock.

The rating of CAE Inc. (CAE) moves up this week, rising from a C to a B. CAE is engaged in the design, development and production of simulation tools and equipment for commercial airlines, business aircraft operators, aircraft manufacturers and military organizations. For more information, get Portfolio Grader’s complete analysis of CAE stock.

AeroVironment, Inc. (AVAV) improves from a C to a B rating this week. AeroVironment designs, tests, and manufactures diversified technological products, including small, unmanned, remote-control military aircraft and rapid battery-charging stations. For more information, get Portfolio Grader’s complete analysis of AVAV 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.