Can attacks on a military base constitute "terrorism"?

The incomparably pernicious Joe Lieberman said yesterday on Fox News that he intends to launch an investigation into "the motives of [Nidal:] Hasan in carrying out this brutal mass murder, if a terrorist attack, the worst terrorist attack since 9/11."  Hasan's attack was carried out on a military base, with his clear target being American soldiers, not civilians.  No matter one's views on how unjustified and evil this attack was, can an attack on soldiers -- particularly ones in the process o...