Back in the early 80's, before I even joined the US Army and still hoped to get into the warrant flight program, I read an article in an army journal proposing to use small gyrocopters - like the one in Mad Max - that could just lift one Hellfire missile each. A forward unit could provide laser designation and the little gyros could come in from all directions essentially undetectable compared to full size attack helicopters. The idea in it was to provide air support cheaply for an insurgency. A GPMG like the PK or the M240 could be slung under the gyro easily as well.