ATP-3-09-30 Observed Fires Download
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Crater and Shell Fragment Analysis and Reports 28 September 2017 ATP 3-09.30 B-9 Pattern or rifling imprints. Width, number, and size of rotating bands. Dimensions and pattern of keying or knurling on the band seat. Dimensions and pattern of keying and knurling impressed on the rotating band. Note. Spin-stabilized artillery projectiles require a rotating band and band seat. Figure B-9. Shell fragment and tail identification, US ammunition TAIL FINS B-26. A mortar may be identified from the tail fins (see figures B-9 on this page, and figures B-10 on page B-10, and B-11 on page B-11). Often, tail fins are found in the fuze tunnel of the crater. A mortar that is not fin- stabilized may be identified from the pieces of the projectile on which the rifling is imprinted.