HOUSTON – The reactions were a mix of shock and betrayal from most people in Sugar Land upon hearing that a young man from the community who is also a UH graduate, and from a military family applied to work for the terrorist group ISIS, also known as the Islamic State.

After graduating in 2008 with a bachelor's degree in political science and a minor in global business, 33-year-old Warren Clark apparently wanted to use that experience to teach young ISIS recruits.

In a cover letter that was found in Iraq by the Program On Extremism at George Washington University, Clark wrote, "I am looking to get a position teaching English to students in the Islamic State. I was born and raised in the United States and have always loved teaching others and learning from others as well."

Clark -- who signed the cover letter with the pseudonym Abu Muhammad "As my resume' shows, I have a variety of skills as well as work experience in education, which I believe will make me an excellent English teacher. Please feel free to contact me at your convenience. Thank you for taking the time to consider me."

People in Sugar Land are wondering what would drive a young American to make such a drastic move.

"It's a shame," Jesus Moreno said. "Especially the threat that ISIS becomes for the entire world and especially the United States being a No. 1 target for that organization."

NBC News reports that the resume attached to the cover letter included an email address, education credentials, and work experience, and the researchers with the Program On Extremism were able to determine that Abu Muhammad was Clark.

UH officials have also confirmed to Channel 2 the information matches Clark.

Neighbors said they have not seen Clark in several years and that his family rarely talks about him.

They also told Channel 2 that both his parents served in the military.