dcfd bx alm/wfd

Dispatch thru automation is 5 engines, 2 truck s, a Squad/TSU, 2 BFC, a Medic Unit & Ambo. WFD=1 added engine, 1 additional truck, DFC/OPS, SAFO, FIU, etc. Okay besides all 1st-5th due engines stand by a water supply/hydrant, whats the fourth thru 6th due engines duties, etc. Can someone point...