These organizations have joined the MTS and IEEE-OES as Co-Participating Societies (CPS) that will support the technical themes of the event. Members of these Societies receive the same “member” benefits at the OCEANS 2021 San Diego – Porto conference including reduced registration rates and hotel room rates. Members of these Societies are encouraged to actively participate by submitting a technical paper, organizing a session, or hosting a special workshop, townhall or forum. For more information on creating a special session, please contact Barbara Fletcher, Oceans 2021 Technical Program Chair. If your society is interested in becoming a co-participant, please contact Robert Wernli, Conference Co-chair.