1000 lb free-fall (slick) as opposed to a KRT (high-drag retarded). Used with either a tail fuse (impact/delay) or a VT (radar) nose fuse for air burst. Tail fuse could be set between a few milliseconds (for penetration before bang) or up to several hours to excite the recipients and give them sleepless nights. The VT fuse was usually set for 50’ and produced a very satisfactory frag pattern against which a tin helmet was not proof!
VT fuses were usually backed up by a tail fuse to cover the rad-alt failure case.
Mog