This week, the ratings of three Aerospace and Defense stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Ceradyne (NASDAQ:CRDN) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). Ceradyne develops, manufactures, and markets technical ceramic products, ceramic powders, and related components for use in the defense, industrial, automotive, and commercial markets. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Earnings Revisions, Earnings Surprise, and Sales Growth, CRDN also gets F’s. The stock price has fallen 12.6% over the past month, worse than the 1% increase the Nasdaq has seen over the same period of time. To get an in-depth look at CRDN, get Portfolio Grader’s complete analysis of CRDN stock.

This week, L-3 Communications (NYSE:LLL) falls to a D (“sell”), worse than last week’s grade of C (“hold”). L-3 Communications is a provider of intelligence, surveillance and reconnaissance systems and aircraft modernization and maintenance services.

For more information, get Portfolio Grader’s complete analysis of LLL stock.

Curtiss-Wright (NYSE:CW) experiences a ratings drop this week, going from last week’s C to a D. Curtiss-Wright designs and manufactures engineered, advanced technologies that perform critical functions in demanding conditions in the defense, energy, commercial aerospace, and general industrial markets. The stock gets F’s in Earnings Revisions and Earnings Surprise. The stock price has fallen 3.3% over the past month. For a full analysis of CW stock, visit Portfolio Grader.

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.