- LTA Mok 163 Squadron is part of the Air Defence Brigade, a brigade of the Air Defence Systems Division, a division of the Republic of Singapore Air Force. 163 Squadron operates the I-Hawk System. The I-Hawk System provides low to medium level air defence as part of the national air defence. With a maximum effective range of 40 km, the I-Hawk can defend against targets manouevering up to 8 Gs, ...bentang.tripod.com/163.htm