Employers must allow employees to take leave for what type of service, according to USERRA?

The correct choice highlights that under the Uniformed Services Employment and Reemployment Rights Act (USERRA), employers are mandated to allow employees to take leave for federal military service. USERRA is designed to protect the job rights of individuals who voluntarily or involuntarily engage in the military service, ensuring that they can return to their civilian jobs after fulfilling their service obligations. This act applies specifically to federal military service, which encompasses active duty in the armed forces and includes reserve components of the uniformed services.

The options that refer to state service, volunteer service, or school service do not fall under the specific protections provided by USERRA. While states may have their own regulations regarding military leave or other types of civic or volunteer service, USERRA specifically focuses on the protection of employment rights for federal military service members, outlining their entitlement to reemployment and continuation of benefits.