301-1.2—What is an “employee” for purposes of TDY allowances?
An “employee” is:
(a)
An individual employed by an agency, regardless of status or rank; or
(b)
An individual employed intermittently in Government service as an expert or consultant and paid on a daily when-actually-employed (WAE) basis; or
(c)
An individual serving without pay or at $1 a year (also referred to as “invitational traveler”).