A UFO sighting by the crew of an Army Reserve helicopter (including Captain Lawrence Coyne) occurred during the night of 18th-19th October 1973 over the Mansfield, Ohio area whilst on route from Columbus to Cleveland. (Commonly referred to as “the Coyne helicopter sighting” or “the Mansfield incident”).
This incident is Case 25 in Isaac Koi's "Top 100" article, since it was referred to in 73 of the books covered by that article.
The National Enquirer reported on 23 June 1974 that it was awarding the relevant helicopter crew $5,000 for supplying the most scientifically valuable UFO evidence in 1973, following the recommendations of the members of its “blue ribbon” panel of UFO experts.
This incident featured in a list of the ten “best” case published by Ronald Story in his book “UFOs and the Limits of Science” (1981).