The SR-71 has proven its value as a complementarysystem to U.S. space-based reconnaissance assets during the prolonged period from 1985 to 1987 when the United States was unable to place new satellites in orbit.
Supposed competitors, such as PayPal's online payment system, in fact offer complementary services rather than threatening to steal business from Visa.
Beyond obvious mood spoilers such as poor hygiene and bad breath, we each have a distinct natural scent that appears to guide us toward choosing a partner with compatible DNA. Scientists have found that women prefer the scents of men with a complementary set of genes that code for the immune system.
Having set in train his defensive program, Mr. Bush can go to the American people and elicit their support for the next steps initially, the relatively low-cost upgrades to the Aegis system and then, as needed, other complementary and cost-effective anti-missile systems (the most attractive option being space-based defenses).