It is possible to make to make a tax-deductible donation to the section. Just send a check, with “Section U Donation” in the memo line, to:
American Association for the Advancement of Science
Executive Office (ATTN: Kelly O’Brien)
1200 New York Ave NW
Washington, DC 20005
Donations can be rolled over from year to year, so there is no expiration date.
If you are interested in supporting AAAS generally, you can find more information at Support AAAS.