An agency may authorize a TCS when it would be more advantageous than to authorize a long-term TDY assignment. Agencies should compare the cost of the long-term TDY allowances and other factors against the cost of the TCS. Employees are generally eligible for a TCS when:

1. (a) They are directed to perform a TCS at a long-term duty location for no less than 6 months, nor more than 30 months; and
2. (b) The employee would be eligible for payment of temporary duty travel allowances authorized under chapter 301 of this subtitle. For exceptions, see § 302-3.401.