A Southwest Airlines jet was forced to make an emergency landing at KCI Wednesday night.The Boeing 737's windshield broke mid-flight after taking off from Washington D.C.'s Reagan National Airport.The reason for that break is unknown, however, because the incident happened at altitude, it was likely not due to a bird strike. Two female WWII veterans on that flight were heading to Fort Leavenworth to be honored in the 6888th Central Postal Directory Battalion Monument Dedication Ceremony. The 6888th was an all-black battalion of the Women's Army Corps, and the first and only all-black WAC unit deployed overseas during WWII.Officials with the Women of the 6888th Organization said the women left the United States in February 1945 with no fanfare, and returned home just as quietly after being credited with clearing out a massive mail backlog of two to three years worth of mail that had been stored in aircraft-sized hangars. Both veterans are in their mid 90s. No injuries were reported. Southwest Airlines issued this statement: Earlier this evening, the outer pane of Southwest Flight #718’s left-side cockpit window cracked upon descent into Kansas City International Airport (MCI). Aircraft windows are designed with multiple, redundant layers, and the cockpit window remained completely intact. The flight landed safely, and no emergency was declared. Finally, the aircraft was taken out of service for a routine window repair, and Customers on the next scheduled flight were accommodated on a replacement aircraft.