; 19 U.S.C. 4316 ) and the National Maritime Security Advisory Committee established under section 70112 of title 46, United States Code. 215. Tier 1 participants (a) Certification The Executive Assistant Commissioner shall certify the security measures and international supply chain security practices of all applicants to and participants in the CTPAT program in accordance with section 213(b)(2) and the guidelines referred to in subsection (c) of this section. Certified participants shall be Tier 1 participants. (b) Benefits for tier 1 participants Upon completion of the certification under subsection (a), a CTPAT program participant shall be certified as a Tier 1 participant. The Executive Assistant Commissioner shall extend limited benefits to a Tier 1 participant. (c) Criteria Not later than 180 days after the date of the enactment of this subtitle, the Commissioner shall update the criteria for certifying a CTPAT program participant’s security measures and supply chain security practices under this section. Such criteria shall include a background investigation and review of appropriate documentation, as determined by the Commissioner. (d) Timeframe To the extent practicable, the Executive Assistant Commissioner shall conclude the Tier 1 certification process within 90 days of receipt of a completed application for participation in the CTPAT program. 216. Tier 2 participants (a) Validation The Executive Assistant Commissioner shall validate the security measures and international supply chain security practices of a Tier 1 CTPAT program participant in accordance with the guidelines referred to in subsection (c) to validate such participant as a Tier 2 participant. Such validation shall include on-site assessments at appropriate foreign and domestic locations utilized by such Tier 1 participant in its international supply chain. (b) Benefits for tier 2 participants The Executive Assistant Commissioner, shall extend benefits to each CTPAT participant that has been validated as a Tier 2 participant under this