Rule 4.1. Serving Other Process
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(a) In General. Process—other than a summons under Rule 4 or a subpoena under Rule 45—must be served by a United States marshal or deputy marshal or by a person specially appointed for that purpose. It may be served anywhere within the territorial limits of the state where the district court is located and, if authorized by a federal statute, beyond those limits. Proof of service must be made under Rule 4(l).
https://www.law.cornell.edu/rules/frcp/rule_4.1
Posiden is the God of earthquakes as well as the sea.
Operation UPSHOT-KNOTHOLE: Project 4.1, The Radiation Hazards to Personnel within an Atomic Cloud
https://apps.dtic.mil/sti/citations/ADA995184