|CHAPTER�4�-�TEMPORARY�DUTY�TRAVEL�TDY
    PART�B:��PER�DIEM�ALLOWANCE
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| | PART B:� PER DIEM ALLOWANCE� | 
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| | U4100� GENERAL� | 
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| | A per diem allowance is designed to offset the cost of lodging, meals, and incidental expenses incurred by a member while performing travel, and/orTDYaway from the member'sPDS.� A per diem allowance is payable for whole days, except for the day of departure from and for the day of return to thePDS, in which case a per diem is computed as prescribed in par.U4125-A.� Per diem rates for locations inCONUSare prescribed in Appendix D.� Per diem rates forOCONUSlocations are prescribed in Appendix B. | 
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| | U4101� WHEN PER DIEM ALLOWANCE IS AUTHORIZED� | 
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| | Unless otherwise specifically provided for or restricted in this Volume, the per diem allowances prescribed in this Part apply for all periods ofTDY, and travel in connection therewith, including but not limited to the following: | 
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| | 1. periods of necessary delay awaiting further transportation, | 
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| | 2. periods of delay at ports of embarkation and debarkation in connection with aPCS, | 
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| | 3. periods ofTDYdirected in aPCSorder, | 
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| | 4. delays for the purpose of qualifying for reduced travel fares (see par.U4325-E). | 
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| | U4102� CIRCUMSTANCES IN WHICH PER DIEM NOT AUTHORIZED� | 
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| | A.� When Not in a Travel Status. | 
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| | A member isn't entitled to per diem for any day before the day during which a travel status begins or for any day after a travel status ends (par.U2200-C). | 
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| | B.� Day of Leave or Proceed Time. | 
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| | A member isn't entitled to per diem on any day classified as leave or proceed time.� NOTE:� A day used in a constructive travel computation forPCSmixed mode travel doesn't make that day a travel day (see par.U5160). | 
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| | C.� WhenPCSMALT PLUSorPCSMileage Is Payable. | 
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| | A� member isn't entitled to per diem for any day thatPCSMALT PLUSis payable. | 
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| | D.� Travel orTDYWithinPDSLimits. | 
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| | Except as authorized in par.U4105-H, a member isn't entitled to per diem for travel orTDYor� performed within the limits of thePDS.� This doesn't preclude payment� of� per� diem� on� the day of departure from or day of return to thePDSin connection withTDYor� away from thePDS.� For transportation entitlement seeChapter 3. This subparagraph doesn't prohibit reimbursement under par.U4510for occasional meals and quarters necessarily procured within the limits of thePDSby members� escorting arms control inspection team/members while engaged in activities related to the implementation of an arms control treaty or agreement during the in-country period referred to in the treaty or agreement (DOD Authorization Act, FY93, P.L. 102-484, dated 23 October 1992.) | 
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| | E.�TDY� Within the Local Area of thePDS(Outside thePDSLimits). | 
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| | A member isn't entitled to per diem forTDYperformed within the local area (outside the limits) of thePDSas defined in parU3500-B, unless overnight lodging is required. Occasional meals may be reimbursed under par.U4510when the member is required to procure meals at personal expense outside thePDSlimits. For transportation entitlements seeChapter 3. | 
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| | F.� Round Trips Within 12 Hours. | 
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| | A member isn't entitled to per diem forTDYwhich is performed entirely within 12 hours.� Occasional meals may be reimbursed under par.U4510when the member is required to procure meals at personal expense outside thePDSlimits.� For transportation entitlements see Chapter 3. | 
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| | G.� Group Travel Status. | 
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| | A member isn't entitled to per diem during a period in which group travel status exists (Part A).� Occasional meals or quarters necessarily procured are reimbursable under par.U4510. | 
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| | H.� Navigational and Proficiency Flights. | 
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| | A member isn't entitled to per diem for navigational and proficiency flights when they are authorized at the member's request. | 
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| | I.� Assignment to Two-Crew Nuclear submarines. | 
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| | A member underPCSorders isn't� entitled to per diem after 2400 on the day the member assigned to a two-crew nuclear submarine (SSBN) arrives at the�� homeport of the vessel and no further travel is performed away from the homeport under those orders (57 Comp. Gen. 178 (1977)). | 
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| | J.�TDYor Training Duty Aboard Government Vessel. | 
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| | A member isn't entitled to per diem for any period ofTDYor training duty aboard a Government vessel when both Government mess and quarters are available.� The period during which this prohibition is in effect begins at 0001 on the day after the day of arrival aboard and ends at 2400 on the day before the day of departure therefrom.� TheTDYor training duty is considered unbroken when a member transfers from one Government vessel to another at the same place and the transfer is made within a 10-hour period.� When quarters are required to be retained at the same or a priorTDYlocation, reimbursement for the cost of such quarters is made under par.U4510. | 
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| | K.� Aboard Vessel Constructed by Commercial Contractor. | 
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| | A member isn't entitled to per diem for the period aboard a vessel constructed by a commercial contractor during acceptance trials before commissioning when both quarters and all meals are furnished without charge.� The period during which this prohibition is in effect begins at 0001 on the day after the day of arrival aboard and ends at 2400 on the day before the day of departure therefrom.� When quarters are required to be retained at the same or a priorTDYlocation, reimbursement for the cost of such quarters is made under par.U4510. | 
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| | L.� Field Duty. | 
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| | A member on field duty isn't entitled to per diem except when the: | 
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| | 1. senior commander in charge of the exercise� (or designated representative)� for each operating location issues a statement to the member indicating that either Government quarters at no charge, and/or Government meals at no charge for enlisted members,� weren't available during stated periods of the field duty; | 
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| | 2. member is participating in the advance planning or critique phase of the operation; or | 
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| | 3. Secretary concerned authorized payment of a per diem to members who are performing field duty while in a travel status under par.U4105-D. | 
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| | The period during which this prohibition is in effect begins at 0001 on the day after the day on which field duty begins and ends at 2400 on the day before the day on which it ends.� This subparagraph doesn't prohibit reimbursement under par.�U4510� for occasional meals or quarters necessarily procured. | 
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| | M.�TDYAboard Foreign (Nongovernment) Vessel. | 
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| | A member isn't entitled to a per diem allowance for any period ofTDYaboard a nongovernment foreign vessel when both quarters and all meals are furnished without charge.� The period during which this prohibition is in effect begins at 0001 on the day after the day of arrival on board and ends at 2400 on the day before the day of departure therefrom.� If a member is required to retain unoccupied quarters at the location whereTDYwas performed just before performing duty aboard a nongovernment foreign vessel, reimbursement for the cost of such quarters shall be made under par.U4510. | 
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| | N.� Member in Missing Status. | 
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| | A member isn't entitled to per diem after 2400 of the day the member is officially carried as or determined to be absent in a missing status under the� Missing� Person� Act (44 Comp. Gen. 657 (1965)). | 
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| | U4105� PER DIEM PAYABLE UNDER SPECIFIC CASES | 
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| | A.�TDYin Connection With Fitting Out or Conversion of a Vessel. | 
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| | When a member is assigned toTDYin connection with fitting out or conversion of a vessel, per diem is authorized during each fitting out or conversion period, including the day of ship commissioning or service craft placement in service,� and day of ship decommissioning or service craft placement out of service.� Authorization for per diem ends on the date the member's assignment is changed fromTDYin connection with fitting out or conversion of a vessel to permanent duty aboard that vessel, even if that change is effected prior to the date of ship commissioning or service craft placement in service.� In determining entitlement to per diem, par. U4102-O applies after a ship or service craft under construction is delivered to the Government. | 
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| | B.� Travel byU.S.or Foreign Government Vessel for 24 Hours or More | 
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| | 1.� Member Not Charged for Meals. | 
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| | A member isn't entitled to a per diem allowance when traveling aboard aU.S.or foreign government vessel when meals are furnished without charge, except on days of embarkation and debarkation if otherwise entitled thereto under subpar. C. | 
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| | 2.� Member Charged for� Meals. | 
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| | Members traveling aboard aU.S.or foreign Government vessel, other than an oceangoing car ferry, of 24 hours or more as passengers (except those aboard forTDYor training) who are charged for meals shall be paid a per diem allowance equal to the cost of the meals furnished, except on the day of embarkation and debarkation. | 
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| | C.� Travel,TDYAboard Commercial Vessel orU.S.Government Vessel Totally Leased for Commercial Operation. | 
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| | Except for the day of arrival (day of embarkation) and the day of departure (day of debarkation), a member (including Coast Guard members performing inspection aboardU.S.merchant vessels) traveling onTDYaboard aU.S.Government vessel leased to and operated by a� commercial company or a commercial vessel, other than an oceangoing car ferry, is entitled to a per diem allowance of $6 per day.� When the $6 rate isn't sufficient to meet the member's subsistence expenses, a per diem rate equal to the anticipated expenses may be authorized/approved.� Such rate may not exceed $25 and the order-issuing official should state in the orders the circumstances warranting the increased rate. | 
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| | D.� Field Duty. | 
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| | The Secretary concerned may prescribe a per diem rate in a lesser amount than prescribed in Appendix B for a member of a unit deployedOCONUSaway from the unit'sPDS.� This rate is paid to the members concerned in lieu of the rate shown in Appendix B regardless of theirOCONUSlocation and may be paid during periods which would otherwise be considered field duty, taking into account the reduced expenses, if any, a member would have while performing field duty during the period covered by the authorization.� The rate prescribed should be paid for the period of time specified and is such that the total per diem paid during the entire period that the member is subject to the reduced rate is about equal to that which the member would receive for the same period underAppendix Bcalculated according to the computation procedures in this Part and excluding the time during which the member performs field duty.� The Secretary concerned may delegate this authority to prescribe such a rate to a chief of an appropriate bureau or staff agency of the headquarters of the department concerned or to a commander of an appropriate naval systems command headquarters, but there may be no redelegations. | 
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| | E.� Member Dies While in aTDYStatus. | 
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| | When a member dies while in aTDYstatus, entitlement to per diem accrues through the date of death.� Entitlement to reimbursement for transportation or aMALTwill accrue from the old station (or lastTDYstation) to the place of death not to exceed the official distance of the ordered travel. | 
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| | F.� Ordered toTDYWhile on Leave | 
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| | 1.�TDYat Leave Point. | 
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| | A member on leave away from thePDSwho receives orders to performTDYat the leave point is entitled to per diem for theTDYperformed in compliance with the orders. | 
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| | 2.�TDYat Other Than Leave Point | 
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