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Integral-equation and numerical techniques are used to determine guidelines in valid electromagnetic compatibility (EMC) testing of missiles. Both thin-wire and body-of-revolution modeling are used. Investigated are two primary aspects. 1) If a near-zone source is used rather than plane-wave incidence, how far must the source be for valid simulation, and 2) how significant is the presence of the rocket exhaust (or plume) in determining subsystem response, and need it be included for valid EMC testing? The simulation validity conclusions reached for the models without apertures apply directly as well to the real-life body with apertures. Numerical results are given over the frequency range of 50-200 MHz to help establish guidelines on testing validity.