This week, five Aerospace and Defense stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

CPI Aerostructures (AMEX:CVU) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. CPI Aerostructures engages in the contract production of structural and other aircraft parts for prime defense contractors, the United States Air Force, and other branches of the armed forces. In Portfolio Grader’s specific subcategories of Earnings Growth, Cash Flow, and Margin Growth, CVU also gets A’s. The stock has a trailing PE Ratio of 8.50. For more information, get Portfolio Grader’s complete analysis of CVU stock.

This is a strong week for L-3 Communications (NYSE:LLL). The company’s rating climbs to B from the previous week’s C. L-3 Communications is a provider of intelligence, surveillance and reconnaissance systems and aircraft modernization and maintenance services. The stock currently has a trailing PE Ratio of 8.40. For more information, get Portfolio Grader’s complete analysis of LLL stock.

This week, Triumph Group (NYSE:TGI) pushes up from a C to a B rating. Triumph Group designs, manufactures, and sells aviation products. Shares of TGI have increased 4.8% over the past month, better than the 3.2% decrease the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of TGI stock.

This week, KEYW Holding Corp. (NASDAQ:KEYW) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). KEYW Holding provides mission-critical cybersecurity and cyber superiority solutions to defense, intelligence and national security agencies. For more information, get Portfolio Grader’s complete analysis of KEYW stock.

SIFCO Industries (AMEX:SIF) earns a B this week, jumping up from last week’s grade of C. SIFCO Industries is engaged in the production and sale of a variety of metalworking processes, services and products produced primarily to the specific design requirements of its customers. For more information, get Portfolio Grader’s complete analysis of SIF 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.