Strike comes days after 2 rockets hit unoccupied part of Ain al-Asad airbase without causing damage or casualties; no claim of responsibility

Six military awards handed out to service personnel injured during January missile strikes on sites housing American troops; remaining 23 to be given later in the week

Small number of soldiers being evaluated for concussion-like symptoms from January 8 attack on Iraqi base, joining 11 other troops flown out for treatment earlier

CNN visits al-Asad airbase, says Iraqis gave advance warning of attack; some forces evacuated, while others took shelter in bunkers well before first missiles slammed into site