Today's Master the Trade setup is a short in Lockheed Martin, symbol LMT. This stock has not participated in the recent market rally and seems ready to break below support near $73. Look to enter on a break of this level for a move down to the $70 range. If the market is to pull in and correct, weak stocks like this should be the first ones to roll over so keep an eye on this stock and other weak charts in the days and weeks ahead.