The historical background is this: the German Luftwaffe equipped its Alpha Jets with a BK 27 cannon in order to hunt for Hinds. There have been regular exercises and tests of varying success. The concept was that a light, nimble and slow plane might be adequate to deal with the relatively fast and heavy Hinds, which were considered a major problem. There was also the plan to equip the Bo-105 with stinger missiles, but that would require new unit.
http://www.jabog49.de/_06%20Warstories/Hind-Killer.pdf
The article is rather gloomy in its assessment as it was written by an Alpha Jet-pilot. I heard very different stories from the CH-53 guys, but that is the nature of military competitive rivalry.
