The Bushes entered and departed the sprawling military facility in secret, having told the base commander they did not want press coverage of their visit, a source told Fox News.
The couple was described as "deeply concerned" about military families on Fort Hood after Army Maj. Nidal Malik Hasan allegedly opened fire on soldiers and civilians, killing 13 and wounding 38.
The Bushes, who have a 1,600-acre property known as Prairie Chapel Ranch less than 30 miles from Fort Hood in central Texas, spent between one and two hours visiting the wounded and their families.