A matching 401k after a certain vesting time. Better healthcare options (most would pay for 'Cadillac' health insurance, including dental). The entire management team not addressing blatant misconduct by other guards/management. HR not addressing issues such as no uniforms, pay discrepancies...
Managing employees, paying promptly for overtime, giving out uniforms when fitted for uniforms, being honest about work hours, sharing with male and female employees the same information/post orders, shift leaders not favoring their buddies, investing in employees who do care and want to do well.