Lockheed Martin falls on $1.6 billion Q2 charge

Shares of Lockheed Martin LMT.N fall nearly 9% to ~$420 in premarket trading

Defense giant recorded charge of $1.6 billion in Q2

Says spent mostly on classified program in aeronautics segment

11 of 24 brokerages rate the stock "buy" or higher, 12 "hold" and one "sell"; their median PT is $527.5

Shares down 5.23% YTD