The revised rules affect the processing of RD, RD, and RM petitions. An RC petition is filed by a labor organization seeking to represent employees. An RD petition is filed by a person seeking to decertify a current bargaining representative. An RM petition is filed by an employer seeking to determine if a labor organization should be recognized as the representative of its employees. The revised rules do not affect the processing of UC (unit clarification), UD (union deauthorization), AC (amendment of certification) or WH (certification of representative under the FLSA) petitions.