From Dale Skran, Deputy Chair, NSS Policy Committee:

One of the major foci of the NSS Policy Committee has been and continues to be supporting the International Space Station and the associated critical Commercial Crew and Commercial Resupply Service (CRS) programs.  One reason both are so important to the ISS lies in the incredible value of the ability to both move new experiments to the ISS on a regular basis, and to return experimental results when they are ready.  It should be noted that the Russian Soyuz is a very tight fit for the three astronauts, and it has virtually no return-to-Earth cargo capacity.  Thus, without the CRS SpaceX Dragon, there would be no way to return experiments to Earth. NASA has produced the interesting half-hour video below that reviews science and technology efforts on the ISS during 2014.