Most troops were either flown out of the base or sheltering in bunkers by 11:00 p.m. local time Tuesday — shortly before the first of four volleys of missiles began at just after 1:30 a.m. on Wednesday, officers said during the first tour by journalists of the air base. The attack lasted around two hours, only targeting the US areas of the air base, which comprise around a quarter of the Iraqi base.Officers called it a "miracle" that there were no casualties at the blasted site, with missiles landing just a few meters from bunkers, and some essential personnel remaining outside throughout.It is the first time troops at the base have spoken in detail of the moments before the attack, revealing that they were able to seek shelter in bunkers shortly before missiles struck.US troops knew there was going to be an attack on their base — they just didn't know what the nature of the attack would be.

Al-Asad airbase
The Al-Asad air base, which houses US troops, is one of the largest and oldest military baRead More – Source
