'Lazy Dog' anti-personnel flechette of the type dropped by the United States Air Force during the Vietnam War. The flechette was delivered via a Mk 44 Cluster Bomb (which held at least 10,000 flechettes). The Mk 44 opened in mid-air after release, so that the flechettes (or 'aerial darts') were then dispersed over the target where they inflicted damage by penetration of soft targets.
Condition is very good, just a little rusting. Length is 4.5cm.