Mark 81
Mark 81 is a general-purpose bomb or ammunition model.
Also recorded as Mk 81; Mk.81; Firecracker.
Overview
250 lb unguided aerial bomb.
In detail
It is associated with United States. The record gives 1950 as its date of establishment or first appearance. It forms part of Mark 80.
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
“Mark 81 bomb”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q2140849: Mark 81
Consult the source