Microvision Inc. has received an additional $2.2 million from the US Army Aircrew Integrated Systems Product Office, at Ft. Eustis, Va., on a contract to expand and accelerate its work on a virtual cockpit optimization program for use in attack and utility helicopters. It will prepare helmet-mounted, full-color displays for flight demonstrations in 2004.   . . .   Agilent Technologies Inc. has appointed Didier Hirsch, vice president and treasurer, to vice president and controller. Hirsch succeeds Dotty Hayes, who is leaving Agilent to join Intuit Inc. Hirsch will assume his new role on April 15 and will remain treasurer until a replacement is named.