There are several task force units within the NG with SOD designations, or other oddball named designations for OPSEC reasons.
It was explained to me a few years ago that the NGSF SOD's (of whatever letter designation) are regional responsaability staff detachments to streamline deployments for NGSF ODA's to said region of responsibility. That was per a long time SF buddy, and he stated that these SOD's were not to be confused with the JTF North/ JTF South SOD's or State run NG CDTF SOD's, or whatever they are being called these days.