http://forums.radioreference.com/amateur-radio-equipment/247949-adapter-h-250-military-type-handset.html


http://www.prc68.com/I/H250.shtml


http://www.nf6x.net/2007/05/antrc-179-regency-net-hfssb-transmitterreceiver/


http://www.ar15.com/archive/topic.html?b=10&f=22&t=657687


http://www.tacticaleng.com/Crypto-Audio-Cables-c26.html


http://www.ar15.com/archive/topic.html?b=10&f=22&t=653041










Notes
the headset you want is a h250/vceb - has volume control
plug on handset: U-329/U
plug needed: U-283/U
http://www.tacticaleng.com/c26/U-183-U-5-Pin-Male-Panel-Mount-Connector-p54.html