The United States and Sudan entered an agreement in November 1976 to provide Sudan with selected arms. The United States sold Sudan transport aircraft financed by Saudi Arabia, followed several years later by F-5 combat airplanes. Believing that Sudan was threatened by neighboring Ethiopian and Libyan forces heavily armed by the Soviet Union, Washington adopted a growing role in Sudan's security. Between fiscal year 1979 and 1982, military sales credits rose from $5 million to $100 million. Subsequent aid was extended on a grant basis. United States aid consisted of M113 APCs, M60A1 tanks, artillery, and Commando armored cars. United States grant aid reached a peak of $101 million in 1982; at the time, this constituted two-thirds of all United States military assistance to sub-Saharan Africa. Sudan granted the United States naval port facilities at Port Sudan and agreed to some prepositioning rights for military equipment for contingent use by the United States Central Command. Sudanese and United States forces participated in Operation Bright Star in 1981 and 1983. When civil war again erupted in the south in 1983, military grants and credits from the United States were abruptly stopped and in 1985 Sudan terminated its participation in Operation Bright Star. After 1987, no assistance was extended with the exception of less than $1 million annually for advanced training for Sudanese officers and training in the maintenance of previously supplied equipment. The Sudanese 9th Armored Brigade has participated as a member of the Saudi-led coalition in Yemen. As of 2014 the Sudanese Army had a jumbled fleet of 465 tanks including 20 M60A1s, 60 &lt;a href="Type%2059%20tank"&gt;Type 59/Type 59D&lt;/a&gt;, 305 &lt;a href="T-54/55"&gt;T-54/55&lt;/a&gt;, 70 T-72M1, and 10 Type 85-IIM and a recent purchase of 150 more T-72s.