Aerial launching cartridges

One of my other collecting interests is Morse keys, an off-shoot of having an amateur radio licence. Whilst I was looking for information in some on-line manuals I came across mention of an aerial launching cartridge using a 40mm projectile fired from an M-79 launcher.

The projectile is a black anodised aluminium cylinder filled with coiled green plastic insulated wire, the projectile being designed to penetrate the tree canopy and leave the wire draped over the topmost branches whilst the end still attached to the fired case is cut and attached to the GRC-109 wireless set.

Does anyone know the period these were produced, have a decent picture, know who made them and when they became obsolete ?



Pictures and discussion of this round can be found starting on this BOCN page and continuing on to the next page: