There has been some controversy as to whether, on behalf of the United States, these agreements could be duly registered by the executive branch without the participation of Congress.121 Security agreements that allow the United States to take military steps to defend another country have generally been ratified as treaties.122 It could be argued that the security agreement that the United States envisions , conducting military operations in Iraq and possibly protecting the Iraqi government from external or domestic security threats. , requires congressional approval to be legally binding under U.S. law. However, since Congress authorized the president to conduct military operations in Iraq, both on the basis of the 2002 authorization to use military force against Iraq and on the basis of subsequent measures, he implicitly authorized the President to enter into short-term agreements with Iraq to facilitate these operations.123 In 1993, the countries concluded a SOFA.104 The agreement was renewed later on 19 September. , 1994; April 28, 1995; November 29, December 1 and December 8, 1995. The countries reached an agreement in 1998 on the treatment of U.S. forces that visited the Philippines.105 This agreement was amended on April 11 and 12, 2006. The difference between this agreement and SOFA, originally concluded in 1993, is that this agreement applies to the visit of US forces that are not stationed in the Philippines. The countries have also reached an agreement on the treatment of personnel of the Republic of the Philippines who visit the United States (counterparty agreement)106 While the U.S. military is the largest abroad and therefore most SOFAs, the United Kingdom, France, Australia, Germany,[2] Italy, Russia, Spain and many other nations are stationed , military forces are also deploying abroad and negotiating SOFAs with their host countries.

In the past, the Soviet Union had SOFS with most of its satellite states. While most SOFS in the United States are public, some remain classified. [3] In 1941, the United States entered into an agreement with the United Kingdom on the leasing of naval and air bases in Newfoundland, Bermuda, Jamaica, St. Lucia, Antigua and Trinity and British Guiana.146 The agreement not only determined the physical site that was leased, but also the status of U.S. personnel staying in the rented community. The rental contract was certainly not a self-contained sofa, but it served the purpose of a SOFA on the sites listed. In the 1950s, 1960s and 1970s, the United States and the United Kingdom entered into other leases that contain provisions for the protection of status in rental premises.