1. Orbital Sciences ( ORB) manufactures rockets and space systems for commercial, military and civil government customers. Revenue for 2010 fourth quarter amplified 23% year-over-year to $346.1 million, while operating income was $24.1 million, up 64% compared to same quarter in 2009. The company received $655 million in new, firm and option contract bookings during the fourth quarter and around $50 million of option exercises under existing contracts. Backlog at the end of December was approximately $2 billion and its total backlog was approximately $4.57 billion. Data from Bloomberg has all the ten analysts covering the stock recommending a buy. Analysts are positive on the stock and imply an upside of 28% over the next one year. The stock is trading at 20.7 times its estimated 2011 earnings. >To see these stocks in action, visit the 5 Defense Stocks With Top Buy Ratings portfolio on Stockpickr.