Sentinel program
Sentinel program is an anti-ballistic missile or military project.
Overview
Proposed American anti-ballistic missile system.
In detail
It is associated with United States.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Sentinel program”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q9335313: Sentinel program
Consult the source