The 4th wave of Filipino Immigration to the United States began after the passage of the Immigration Act of 1965 and continues to the present day. This allowed the entry of as many as 20,000 immigrants annually. This wave of Filipinos was also called the "brain drain", and consisted mainly of professionals: doctors, lawyers, nurses, engineers, as well as the military, Filipinos who continued to join the navy off Sangeley Point in Cavite City, Philippines.
Source: Cordova, Fred. "Filipinos: Forgotten Asian Americans". Dubuque, Iowa: Kendall/Hunt Publushing Co., 1983.