MIL-T-28691(YD) (NOTICE 1), MILITARY SPECIFICATION, TRUCK, FIREFIGHTING, STRUCTURAL, 1,000 GPM, 4 BY 2 WITH 65 FOOT TELESCOPING BOOM ESCAPE LADDER AND WATER TOWER (16 OCT 1997)., This notice should be filed in front of MIL-T-28691(YD), dated 6 November 1991. MIL-T-28691(YD) is inactive for new design and is no longer used, except for replacement purposes. This specification will be maintained until acquisition of the product is no longer required, whereupon the specification will be canceled.