The XM29 OICW was being developed from the early 90's until recently by Heckler & Koch, and Alliant Arms. After spending many years and hundreds of thousands of dollars in development, the OICW project was scrapped, after it failed to overcome a few design flaws in its final test stages. It is believed that the OICW -might- still see service with the U.S. Armed Forces, but if so... it will be at a much later date than was originally predicted.
While the OICW was scrapped, development of its 5.56mm Assault Rifle component was continued in the form of the XM8 Compact Assault Rifle, which will most likely begin to replace the aging AR15/M16/M4 family of Assault Rifles, at least in the front lines of the U.S. Armed Forces. The U.S. Special Forces, however, are having a different weapon developed for tthem in the FN SCAR.
5.56mm Kinetic (30-round clip)
20mm HE GL (6-round clip)
A top-secret weapon developed by Alliant Techsystems and H&K. Equipped with revolutionary new technology to increase lethality & range, and equipped with a built-in detonator (supposedly), and equipped with a built-in scope with powerful magnification for sniping purposes.
You can also use this gun in the Ghost Recon series! ^.^ take it from me....it's THE SHIT. ^-^
Whereas the only disadvantage of the OICW is its cubersome size, limiting the soldiers mobility.
But the future will probably solve this problem.
Now tanks and aircraft are potentially threatened by one man.
In other words: The OICW makes you into a one man army.