Which year marked the introduction of the official TSA (blue) shirt?

The introduction of the official Transportation Security Administration (TSA) blue shirt occurred in 2014. This shirt was part of a uniform initiative aimed at creating a more professional appearance for TSA personnel while fostering a sense of unity among employees. The choice of 2014 is significant as it reflects the TSA's ongoing evolution in branding and employee representation, aligning their uniform standards with broader public service goals. The other years provided do not correspond with the specific implementation date of this uniform policy, making 2014 the correct answer.