Why do you think this is emergency Shutdown? Do you mean, when a reduction in force is caused by circumstances not reasonably foreseeable? AT is good source, but here is the Horses Mouth. CFR › Title 5 › Chapter I › Subchapter B › Part 351 › Subpart H › Section 351.801 https://www.law.cornell.edu/cfr/text/5/351.801 (See Notice period) And here https://www.opm.gov/policy-data-oversight/workforce-restructuring/reductions-in-force/workforce_reshaping.pdf