ANKARA, Turkey — Two Turkish defense companies will showcase new systems for air defense and unmanned ground combat at the IDEF exhibition in Istanbul this week. Military electronics specialist Aselsan , Turkey’s biggest defense firm, said July 23 that it launched the GÜRZ (“mace” in English) air defense system, designed to protect stationary units as well as military convoys on the move. The weapon is “an answer to an increase in need to possess assets with strategic maneuvering capabilities,”