During a training mission Special Agents Christopher Lorek and Stephen Shaw began their descent on Friday onto a ship roughly a dozen miles off the coast of Virginia, the helicopter suddenly tilted because of a strong gust of wind. The two men, holding onto the ropes and loaded down with gear, lost their grips and fell. http://www.nytimes.com/2013/05/21/us/2-fbi-agents-die-in-counterterrorism-training-exercise-at-sea.html?ref=us The unit, which has a little fewer than 100 agents,  responded to the bombings at the Boston Marathon last month. In that instance, agents from the unit were sent from Quantico after the attacks to deal with finding other explosives in the city. The hostage rescue team is part of the bureau’s Critical Incident Response Group, a military like unit that is “ready to deploy anytime, anywhere” to crises like terrorist attacks. Its agents often wear uniforms similar to soldiers and carry high-powered assault rifles.