; (2) address irregular migration flows that may affect the United States, including any detention or removal operations of the recipient government; or (3) protect and expedite legitimate trade and travel. (c) Limitation on transfer The Secretary may not— (1) transfer any equipment or supplies that are designated as a munitions item or controlled on the United States Munitions List, pursuant to section 38 of the Foreign Military Sales Act ( 22 U.S.C. 2778 ); or (2) transfer any vessel or aircraft pursuant to this section. (d) Related training In conjunction with a transfer of equipment pursuant to subsection (a), the Secretary may provide such equipment-related training and assistance as the Secretary determines necessary. (e) Maintenance of transferred equipment The Secretary may provide for the maintenance of transferred equipment through service contracts or other means, with or without reimbursement, as the Secretary determines necessary. (f) Reimbursement of expenses (1) In general The Secretary may collect payment from the receiving entity for the provision of security assistance under this section, including equipment, training, maintenance, supplies, sustainment support, and related shipping costs. (2) Transfer Notwithstanding any other provision of law, to the extent the Secretary does not collect payment pursuant to paragraph (1), any amounts appropriated or otherwise made available to the Department of Homeland Security may be transferred to the account that finances the security assistance provided pursuant to subsection (a). (g) Receipts credited as offsetting collections Notwithstanding section 3302 of title 31, United States Code, any reimbursement collected pursuant to subsection (f) shall— (1) be credited as offsetting collections to the account that finances the security assistance under this section for which such reimbursement is received