ATP-3-09-30 Observed Fires Download
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Appendix B B-8 ATP 3-09.30 28 September 2017 ROCKET CRATERS B-21. A crater resulting from a rocket impacting with a low or medium angle of fall is analyzed in the same manner as an artillery crater resulting from a projectile armed with fuze quick. However, if the rocket impacts with a high angle of fall, the crater is analyzed in the same manner as a crater resulting from a mortar round. The tail fins, rocket motor, body, and other parts of the rocket, may be used to determine the caliber and type of rocket fired. SHELL FRAGMENT ANALYSIS B-22. Dimensions of the parts as well as complete shells vary according to the caliber and type of shell. Shell fragments a must be collected to approximate the type, caliber, and country that manufactured the weapon and projectile. A typical shell is shown in figure B-8. Figure B-8. Projectile DUDS AND LOW-ORDER BURSTS B-23. The most logical means of identifying the caliber of a projectile is to inspect a dud of that caliber. However, since a dud may not always be 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. Available (or, if available, may be too dangerous to handle), a low-order burst is the next best means of identification. When the explosive filler is incompletely detonated, a low-order burst occurs and large shell fragments result. Such Note: Spin-stabilized artillery projectiles require a rotating band and band seat. Large pieces can be used to identify thread count, curvature, d. Tail Fins. A mortar may be identified from the tail wall thickness, and other information not obtainable on tin. Often, tail fins are found in the smaller fragments. (see figures B-1 and B-8.) HIGH-ORDER BURST B-24. A high-order burst normally results in small, deformed fragments. These fragments are useless for identification purposes unless they include a section of either the rotating band or the rotating band seat. Fragments of either of these sections positively identify the shell, since each shell has its own distinctive rotating band markings. ROTATING BAND AND BAND SEATS B-25. A shell may be identified as to caliber, type and nation of origin from the following (see figure B-9):