When I was a kid (quite a while ago) it was reported that the US Army had completed a sophisticated Howitzer project just in time to decommission Howitzers from

When I was a kid (quite a while ago) it was reported that the US Army had completed a sophisticated Howitzer project just in time to decommission Howitzers from its standard deployment. Meaning, they didn't need them any more. Years later more research on a defunct weapon? Or does this revitalize it somehow?