BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
YOUNG SOLO'S ADVENTURES CONTINUE! HAN SOLO escapes Corellia by joining the IMPERIAL NAVY, vowing to return for QI'RA. But how does a thief used to the chaos of the streets adjust to the order and discipline of the military? Not well! Han's dream of becoming a pilot is quickly grounded as he realizes he may not even survive basic training!