 Complete the following phrase:  It was not the first use of the name Guzman el Bueno for an army division: Division de Infanteria Experimental No. 21 Guzman el Bueno DIE 21 had existed from the 1950s as part of the Spanish Pentomic structure. The previous DIE 21 had been part of Army Corps 2 Seville and had had its headquarters at Algeciras, including Agrupación de infantería AIs at Sevilla AI Soria 9; AI Extremadura 15 Algeciras; AI Pavía 19 San Roque; AI Álava 22 Tarifa; and AI Granada 34 Huelva, plus Agrupación Blindada 