In 1981 he was drafted to the Armour Corps, served as a combat fighter, officer and a company commander. He commanded operational activity throughout his career.
In 1990, he was appointed commander of the 82 'Gaash' armour Battalion of 'Saar Mi-Golan' 7th Brigade, and was promoted to the rank of Lieutenant Colonel.
Between the Years of 1991-1994, Ayish served as a deputy brigade commander and afterwards as an operations officer of the 36 'Gaash' Division in the Northern Command.
Later on, between the years of 1996-1999, he was promoted to the rank of Colonel and was appointed the commander of a reserve armour brigade as well as commander of the Armour and Engineering Training Centre at the IDF NTC.
Between the years of 1999-2001, Ayish was appointed commander of the 7th Brigade, in the Golan Heights - Northern Command.
Between the years of 2002-2004, during the Second Intifada, he served as the head of the Operations Department in the Operations Branch at the General Staff.
Between the years of 2004-2005 he served as the commander of the 'Mapatz' 319 Division of the Northern Command and was promoted to the rank of Brigadier General.
Between the years of 2005-2008, during the Second Lebanon War and the period that followed it, Ayish served as the Ground Forces Command Chief of Staff.
Between the years of 2008-2010, Ayish served as the head of the 'Et Ha’asif', an IDF Defense efficiency program. This program was implemented with McKinsey & Company which is a global management consulting firm.
In October 2010, he was promoted to the rank of Major General and was appointed as the Head of the Operations Branch (J3) in the General Staff.
In September 2012, Maj. Gen. Ayish was appointed to the position of the Israeli Defense and Armed forces Attaché to the U.S and Canada in the U.S.A.
Maj. Gen. Ayish has a B.A. in Political Science from the Haifa University; he is graduated of the Joined Staff and Command course in the British Army. Ayish has a M.A in Business Administration from the Tel-Aviv University.
Maj. Gen. Ayish is married to Dalia, and is the father of a daughter and three sons.