“ Employees whose expected service will be for brief periods but not to exceed one year. (b) Employees paid by the hour, day, month, or year when actually employed, whose employment is periodic, part-time, or recurrent and for whom a regular tour of duty is not contemplated. ”

“ Employees and consultants paid on a contract or fee basis. (d) Employees paid on a piece-work basis, except when serving under regular or permanent appointment. (e) Cooperative employees not wholly under the control of the Federal Government and not otherwise subject to the Civil Service Retirement Act. (f) Officers and employees without compensation or with nominal compensation of $12.00 or less per annum. (g) Intermittent alien employees engaged on work outside the continental limits of the United States. (h) Member and patient employees in government hospitals or homes. ”