For a USAR unit that falls under a stateside ADCON unit, but supports an overseas OPCON unit while on AT, which unit patch do they wear?

For a USAR unit that falls under a stateside ADCON unit but supports an overseas OPCON unit while on Annual Training, which unit patch do they wear. This isn't specifically addressed in 670-1. Researched this years ago but can't find the reg. Pretty sure the unit wears the OPCON patch while actually supporting their AT mission and wears the ADCON patch the other 11 months... Anyone know where I can find it in writing so I don't have to dig through 6 years worth of emails?