program includes air, rental car, train, bus, dining, lodging, and travel management, but does not include rebates or refunds attributable to the use of the Government travel card, the Government Purchase Card, or Government travel arranged by Government Contracted Travel Management Centers. (2) Refund The term refund includes miscellaneous receipts credited to the Department identified as a refund, rebate, repayment, or other similar amounts collected. . (b) Clerical amendment The table of sections at the beginning of chapter 8 of such title is amended by inserting after the item relating to section 455 the following new item: 456. Managed travel program refunds. . (c) Clarification on retention of travel promotional items Section 1116(a) of the National Defense Authorization Act for Fiscal Year 2002 ( Public Law 107–107