This presented a problem. As fellow LLNL physicist Hugh DeWitt put it, "It has long been known that Teller and Wood are extreme technological optimists and super salesmen for hypothetical new weapons systems," or as Robert Park puts it, "Anyone who knows Teller's record recognizes that he is invariably optimistic about even the most improbable technological schemes." Although this salesmanship had little effect in US military circles, it proved to be a continual annoyance in Congress, having a negative effect on the lab's credibility when these concepts failed to pan out. To avoid this, Roy Woodruff, the associate director of the weapons section, went with them to ensure the two did not oversell the concept. In meetings with various congressional groups, Teller and Wood explained the technology but refused to give dates on when it might be available.