The Transportation Security Administration (TSA) intended to expand TSA PreCheck to 25 million air travelers at a rate of more than 5 million enrollments per year. We evaluated whether the current TSA PreCheck Application Program adjudication process will allow TSA to meet its enrollment goals. TSA did not allocate additional resources or staff to the TSA Adjudication Center, which had multiple vacancies and was tasked with manually processing about 26 percent of TSA PreCheck Application Program applications. To make matters worse, in June 2016, TSA PreCheck applications surged, leaving the Adjudication Center overwhelmed with applications to process. As the application queue grew, TSA brought on detailees from other Federal agencies to assist with adjudications part time, but they did not have a significant impact. Further, the Adjudication Center relies on a manual caseload assignment and reporting process, which is inefficient for the volume of TSA PreCheck applications needing adjudication.