As outlined by Walker, Kix stopped shaving due to the sorrow he felt each time he looked from the mirror as he was reminded of his fallen comrade brothers who he was not able to conserve. Sometime later on in the war, Kix accompanied the 501st legion, led by Jedi https://gunnermnmml.mywikiparty.com/1296351/5_simple_statements_about_kix_explained