Matter of Huang, 19 I. & N. Dec. 749, 754 (BIA 1988) ("While the burden of proving admissibility is generally on the applicant in exclusion proceedings, see section 291 of the Act, 8 U.S.C. 1361 (1982), where an applicant for admission has a colorable claim to returning resident status, the burden is on the Service to show that the applicant should be deprived of his or her status as a lawful permanent resident. Matter of Salazar, 17 I & N Dec. 167 (BIA 1979); Matter of Kane, [15 I & N Dec 258 (BIA 1975)]").