Seargent Major Kasal.
There is video coverage at these links:
It's a testament to Kasal's character that one seldom finds reference in the news stories to the Marines he directed to cover his back and the backs of those who went with him into the house.
They disappeared, resulting in the 30 - 40 minute delay in getting assistance. One could hope that they had good reason to believe they were needed more elsewhere. It's great to see him moving around in the video. He ran a mile and a half on Saturday. "It wasn't pretty, but I made it."