AWOL
abbreviation
ˈeɪwɒl 
ˈeɪwɔːl absent without leave (used especially in the armed forces when somebody has left their group without permission)
He's gone AWOL from his base. (humorous) The guitarist went AWOL in the middle of the recording.
Definition of AWOL abbreviation from the Oxford Advanced Learner's Dictionary
ˈeɪwɒl ˈeɪwɔːl 