Arsenal Football Club Academy, metonymically known as Hale End, is the youth system of Arsenal Football Club based in Hale End, London, England. The academy teams play in the Professional Development League, the highest level of youth football in England. The club also competes in the FA Youth Cup and UEFA Youth League competitions. Former player Per Mertesacker is the current academy manager.
Arsenal Under-21s, previously referred to as the Reserves, is the highest level squad within the setup. From Wikipedia