As Eugene noted below, the Pentagon did not let Col. Morris Davis testify before the Senate about military commissions. As it turned out, the military sent Brigadier General Hartmann instead, and he was "not equipped to answer" some of the Senate Committee's questions, such as whether it would violate the Geneva Convention if Iran waterboarded a downed U.S. airman. Has it really come to this? More from Marty Lederman here.