Home2009 Treaties and Agreements ...United Kingdom (09-925) – Memorandum of Understanding for the Loan of Orion High Power Microwave (HPM) Test System hide United Kingdom (09-925) – Memorandum of Understanding for the Loan of Orion High Power Microwave (HPM) Test System TIAS Office of Treaty Affairs September 25, 2009 Defense: Cooperation Memorandum of understanding signed at Arlington and London September 9 and 25, 2009; entered into force September 25, 2009. Download attachment [474 KB] Tags Defense Treaties United Kingdom