Stocks lost some early momentum Tuesday and finished with their first loss in six days, the AP reports. The Dow Jones industrials slipped 14 points, or 0.1%, to 26,048, after rising as much as 186 points just after trading began. Shares of defense contractors led the declines. Raytheon and United Technologies, which have agreed to merge, fell sharply and other defense companies dropped as well. Raytheon lost 5.1%. Health care stocks also fell. CVS dropped 1.9% while Humana lost 2.6%. The S&P 500 index slipped 1 point to 2,885. The benchmark index is still up nearly 5% so far this month after dropping 6.6% in May. The Nasdaq dropped less than a point and is at 7,822. The Russell 2000 index of small companies fell 5 points to 1,518. (More stock market stories.)