Section 1639.7 - Types of decisions(a) A board may grant a classification into Class 2-D until the end of the academic school year.(b) Upon the expiration of a 2-D classification, a board shall review any request for extension of the classification in the same manner as the first request for Class 2-D. This section does not relieve a registrant of his duties under § 1621.1 of this chapter.(c) The board may deny a claim for Class 2-D when the evidence fails to merit any of the criteria established in this section.47 FR 4657, Feb. 1, 1982, as amended at 52 FR 24458, July 1, 1987