In what year did TSA receive a national trademark?

The correct answer is 1990, as it marks the year when the Transportation Security Administration (TSA) received its national trademark. This was significant because it symbolized the federal government's formal recognition of TSA as the agency responsible for enhancing security and safety in transportation, especially following the events that led to heightened security concerns in the aviation sector. The establishment of the trademark allowed TSA to build its brand and ensure that the public was aware of its initiatives and campaigns focused on transportation security. The timeframe is crucial in understanding the evolution of security policies in the United States, especially during the changing landscape of aviation security in the late 20th century.