Original, itemized receipts are required for any expenses for which reimbursement is claimed. Note that airfare reimbursement from NSF funds requires the use of a U.S. flag carrier (i.e., a U.S. airline).
Graduate students are encouraged to share rooms and will be reimbursed on this basis.
If you plan to request financial support, consider downloading and filling up the following forms:
That may spare you paperwork during the conference, and the direct deposit forms could require information that you may not have with you at the conference. We would prefer if you were to submit the forms at the conference.