APKWS is NOT interchangeable between the USA and USMC. Someone had a thread on the topic a couple of years back and I've pulled a ref or two off my first Helo PP concerning the AH-1Z. APKWS is USMC all the way well, at least until the USA dropped out of the program. In 2008 the USN deciding to support the CORPS in finding a better precision orientated system to replace both the ZUNI and HYDRA II rockets being used at the time and picked up and continued to finance the APKWS Program on it's own. Further testing now completed will see the APKWS II on the USMC AV-8 HARRIERS and USAF A-10's. APKWS is a BAE system while DAGR is a Lockheed Martin system. The war got the ball rolling for both with the overview below...
http://defense-update.com/features/2...ts_170709.html
These are for FYI...
https://mfcbastion.external.lmco.com..._Card-DAGR.pdf
http://defense-update.com/newscast/0...80307_dagr.htm
http://www.upi.com/Business_News/Sec...2351204584218/
http://defenseupdates.blogspot.com/2...v-vehicle.html
http://www.defense-update.com/newsca...009042010.html
Kept the ref source easy as the same is covered by all my "usual" suspects is these matters. The bottom line is simply that the Army was hedging it's bets between the two systems and in the end had to make a decision. They of course choose DAGR. Makes you wonder who won the annual Army/Navy game that year, it might explain each services choice!?!
I believe the DAGR is still being evaluated by the Army, as I can't find any info to support they bought the system.
Regards,
Pat