ABC News -- In the aftermath of the shootings at Fort Hood, Army Chief of Staff Gen. George Casey told Charles Gibson that the troops are stretched thin, but that the drawdown in Iraq and Afghanistan will relieve rising stress levels among troops. We are deploying at a rate that we cant sustain. So, we are stretched and have been stretched for about five years. However, we have been increasing the size of the army and were 40,000 soldiers bigger than we were just two and a half years ago, and that has a positive impact on us, he said. As the drawdown in Iraq continues, our projections are that the time the soldiers spend at home is going to increase and stress will come down. Casey, who was the top U.S. commander in Iraq for three years, flew to Fort...