The Second Air Brigade, based in Los Cerrillos, Santiago, covers the region southward from the R�o Huasco to the R�o B�o-B�o and consists of the Second Wing (Ala 2), which combines the Second Group (Grupo 2) with the existing Tenth Group (Grupo 10) and Eleventh Group (Grupo 11). The Second Wing includes GAA 31 and GCE 32. The Second Group in Los Cerrillos is a special unit operating Canberra PR-9s in the Reconnaissance Squadron (Escuadrilla de Reconocimiento) and Beech 99As in the Electronic War Squadron (Escuadrilla de Guerra Electr�nica). The Second Group's inventory includes the two Gates Learjet 35As of the Aerial Photogrammetric Service (Servicio A�reo de Fotogrametr�a--SAF) that are based at Los Cerrillos.