...Tight U.S. labor markets and possible mandatory vaccinations are likely to pressure profitability in 2022. Typically, the industry's profit margins are counter-cyclical because high unemployment rates associated with economic recessions have been a tailwind for Allied Universal's profitably due to lower non-billed overtime, training, and recruiting costs. However, over the past two quarters, Allied reported year-over-year and sequential gross margin declines because the tight U.S. labor market hurt the company's employee turnover and increased nonbillable overtime wages. This year, turnover has spiked to about 70%, up from about 60% in 2020. In addition, possible federal and state mandatory vaccination requirements for employers may lead to additional employee churn. As of the recent quarter, about 80% of its approximate 800,000 global employees were vaccinated. Partially offsetting the expense pressures is our expectation for higher revenue growth when contracts reset, ultimately passing...