32 CFR §776.90

1. (a)Outside practice of law is defined as any provision of legal advice, counsel, assistance or representation, with or without compensation, that is not performed pursuant or incident to duties as a covered USG attorney (including while on terminal leave). Occasional uncompensated assistance rendered to relatives or friends is excluded from this definition (unless otherwise limited by statute or regulation). Teaching a law course as part of a program of education or training offered by an institution of higher education is not practicing law for purposes of this rule.
2. (b)The requirement to seek permission prior to engaging in the outside practice of law does not apply to non-USG attorneys, or to Reserve or Retired judge advocates unless serving on active duty for more than 30 consecutive days.