manipulative electronic deception: actions to eliminate revealing telltale indicators that could be used by the enemy (or to convey misleading indicators)
electronic warfare: military action involving the use of electromagnetic energy to determine or exploit or reduce or prevent hostile use of the electromagnetic spectrum
phase iv clinical trial: sometimes the FDA approves a drug for general use but requires the manufacturer to continue to monitor its effects; during this phase the drug may be tried on slightly different patient populations than those studied in earlier trials