rb wrote:

The US navy in particular seems to have seen the writing on the wall for
some time now, hence (I would assume) part of the reason for their
interest in developing the 'Millenium' gun and expressed interest in the
naval 57mm cannon.
http://www.lockheedmartin.com/wms/fi...=400&jsi=false
http://www.navyleague.org/sea_power/dec_04_46.php

The 35mm Millennium gun would qualify - that's designed to fire the
AHEAD ammo I mentioned - but I'm not so sure about the Bofors 57mm. In
the AA mode that uses radar aiming and proximity fuzes, and I'm not
sure if either would be sensitive enough to respond to a small stealthy
UAV.

Tony Williams
Military gun and ammunition website: http://www.quarry.nildram.co.uk