14 CFR § 1214.603 - Official Flight Kit.
(a) Purpose. The Official Flight Kit (OFK) on a particular mission allows NASA, and other domestic and friendly foreign countries' organizations with NASA approval, to utilize mementos as awards and commendations or preserve them in museums or archives. No personal items will be carried in the OFK.
(b) Approval of contents. At least 120 days prior to the scheduled launch of a particular mission, an authorized representative of each organization desiring mementos to be carried on a flight in the OFK must submit a letter or request describing the item(s) to be flown and the intended purpose or distribution. Letters should be directed to the Associate Administrator for Human Exploration and Operations, NASA Headquarters, Washington DC 20546.