42 CFR §68.16

1. (a)When a shortage of funds exists, participants may be funded only partially, as determined by the NIH. However, once an NIH LRP contract has been signed by both parties, the NIH will obligate such funds as necessary to ensure that sufficient funds will be available to pay benefits for the duration of the period of obligated service unless, by mutual written agreement, the parties specify otherwise.
2. (b)Additional conditions may be imposed as deemed necessary.