The E23 munition was a cardboard sub-munition developed by the United States biological weapons program for use as an anti-crop weapon. The E23 underwent a conversion for use as a vector weapon and was briefly used in large-scale entomological warfare trial but technical issues forced it from the tests.

A precision-guided munition (PGM, smart weapon, smart munition, smart bomb) is a guided munition intended to precisely hit a specific target, to minimize collateral damage and increase lethality against intended targets. During the First Gulf War guided munitions accounted for only 9% of weapons fired, but accounted for 75% of all successful hits.

A loitering munition (also known as a suicide droneUS army may soon use Israeli-designed ‘suicide drones’, Jerusalem Post, June 2016China Unveils a Harpy-Type Loitering Munition, Israel Defense, March 2017Meet Israel’s ‘Suicide Squad’ of Self-Sacrificing Drones, The Drive, August 2016 or kamikaze droneKamikaze drone loiters above, waits for target, CNET, June 2009'Kamikaze drones' add a new layer of lethality to remote force, C4ISRNET, August 2015) is an aerial weapon system category in which the munition loiters (waits passively) around the target area for some time and attacks only once a target is located.Loitering Munition Availability Expanding Internationally, Aviation Week, April 2016Loitering Weapon Systems – A Growing Demand, h-ils, December 2016Watch This Drone Turn Into A Missile, Popular Science, August 2015 Loitering munitions enable faster reaction times against concealed or hidden targets that emerge for short periods without placing high-value platforms close to the target area, an