Above that in the ELM it statesWe're not letter carriers? News to me. Regardless, that section of the ELM states uniform headgear is at the option of that list of employees.
However, the next section, ELM 934.12, states: Wearing of the cap is mandatory for (a) casual employees, (b) new employees who are not required to wear a uniform during the first 90 days of their employment, and (c) all other employees who are authorized only a cap as a means of identifying them with the Postal Service. No substitute headgear may be worn by these employees.
934.11
For the following employees, the wearing of uniform headgear is at the option of the employee:
- Area maintenance technician/specialist.
- Letterbox mechanic.
- Letter carrier.
- Motor vehicle operator, tractor trailer operator, driving instructor.
- Ramp clerk and transfer clerk, AMF.
- Clerk/special delivery messenger.