MIL-STD-810G Method 513.6 acceleration test g-levels for military materiel. Covers three test types: structural (Table 513.6-I), operational (Table 513.6-II), and crash hazard (Table 513.6-III). Vehicle categories include aircraft, helicopters, manned aerospace vehicles, aircraft stores (wing/sponson, wing tip, fuselage), and ground-launched missiles. G-levels are given as multiples of forward acceleration A (or as fixed g values for helicopters and crash hazard). Six directions: fore, aft, up, down, left, right. Crash hazard records also include duration in milliseconds. Use when platform-specific acceleration criteria are unavailable.