SCA To Date and Motivation for Change. These slides will discuss why the JTRS Program Executive Office (JPEO) is aggressively procuring Software Defined Radio (SDR) consortium and industry assistance to spearhead a high impact evolution of the Software Communications Architecture (SCA) intended to deliver better radio performance along with a smaller footprint for waveforms and radio software. The webcast audience will learn about innovative SCA change proposal details and identified opportunities for near term radio performance impact with rapid market availability of these new capabilities via highly motivated COTS SDR software and development tool vendors.