Military.com  reports that “Brussels joined the list of places Wednesday where U.S. troops can’t go without a general’s approval and the advice from the command on what to do if caught up in an attack came down to this: ‘Run, hide and then fight if necessary.'”  

“The warnings came after an Air Force lieutenant colonel and four members of his family were injured in the nail-laden bomb attacks Tuesday on Brussels’ Zaventem international airport and at the Maelbeek stop on the Brussels subway near the U.S. embassy and the headquarters of the European Union.”  

“Air Force spokesmen said they could not immediately give an update on the conditions of the officer and his family members due to privacy reasons but initial reports said the injuries don’t appear to be life-threatening. The service said that the officer was assigned to Joint Force Command Brunssum, a NATO command in the Netherlands which provides support to the mission in Afghanistan.”