The extra-duty employment officers are at all times subject to the policies, rules and regulations governing employees of the North Myrtle Beach Dept. of Public Safety (NMBDPS). A customer has no authority over NMBDPS personnel and is restricted to providing only a general assignment of duties to be performed by the extra-duty employment officer. Those rules never supersede NMBDPS policy or procedures and employers of the extra-duty employment officers should be so advised. Extra-duty employment officers remain under the exclusive control of the NMBDPS and are accountable for strict adherence to NMBDPS rules and regulations. Any conflicting rules of employers of extra-duty employment officers will be disregarded. The extra-duty employment officer shall refuse to perform any duties deemed to be in conflict with the guidelines established by the NMBDPS. As determined by the NMBDPS, extra-duty employment officers may be recalled to on-duty status at any time for emergency operations. The North Myrtle Beach Dept. of Public Safety is not obligated to provide extra-duty employment services. The North Myrtle Beach Dept. of Public Safety extra-duty employment officers are not permitted to receive cash from customers for any reason unless authorized by the Director of Public Safety. The North Myrtle Beach Dept. of Public Safety reserves the right to require a minimum number of extra-duty employment officers for assignment to certain extra-duty details.