Yu might want to photocopy it and keep it separately from the original to avoid any lost. The IAP-66 is issued initially for the period of your appointment at NIST and can be extended up to a maximum of three years residence time in the United States. If you will be leaving the united States, a valid visa stamp is also necessary to reenter this country. To do so, please read those instructions. Unless explicitely stated, the Association does not endorse any commercial products or organizations.
All references are for information purposes only.