I don't know. I only worked on drone stuff for comm trades for Predator/Reaper which is a very large drone. The small drones would not have much payload capability so I don't know what the CONOPS would be for them in combat situations. I guess that individually a small drone would make a good recon platform.
They have small drones that can carry SMGs, flamethrowers and, presumably, shaped charges.
I would think the US armed forces would see a need to be able to destroy swarms of such vehicles.