The non-seniority rights and benefits to which an employee is entitled during a period of service are those that the employer provides to similarly situated employees by an employment contract, agreement, policy, practice, or plan in effect at the employee's workplace. These rights and benefits include those in effect at the beginning of the employee's employment and those established after employment began. They also include those rights and benefits that become effective during the employee's period of service and that are provided to similarly situated employees on furlough or leave of absence.

If the non-seniority benefits to which employees on furlough or leave of absence are entitled vary according to the type of leave, the employee must be given the most favorable treatment accorded to any comparable form of leave when he or she performs service in the uniformed services. In order to determine whether any two types of leave are comparable, the duration of the leave may be the most significant factor to compare. For instance, a two-day funeral leave will not be “comparable” to an extended leave for service in the uniformed service. In addition to comparing the duration of the absences, other factors such as the purpose of the leave and the ability of the employee to choose when to take the leave should also be considered.

As a general matter, accrual of vacation leave is considered to be a non-seniority benefit that must be provided by an employer to an employee on a military leave of absence only if the employer provides that benefit to similarly situated employees on comparable leaves of absence.