SURF53 USAF RC-135 Rivet Joint just SE of Hong Kong, trackin' and totally wanting to be seen-out of Kadena AB-Okinawa

Rivet Joint's (cap#3) modifications are primarily related to its on-board sensor suite, which allows the mission crew to detect, identify and geolocate signals throughout the electromagnetic spectrum. The mission crew can then forward gathered information in a variety of formats to a wide range of consumers via Rivet Joint's extensive communications suite. The interior seats more than 30 people, including the cockpit crew, electronic warfare officers, intelligence operators and in-flight maintenance technicians

https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104608/rc-135vw-rivet-joint/