As part of the naturalization process , a form requires a signature acknowledging the applicant will swear allegiance to the United State and might be required to serve in the military . Emir Muaz , a Dagestan insurgent fighting in the Caucasus region , was killed in action . " Tsarnaev filed suit seeking using the fighter 's last name as his first name . Official to CNN : ` ` There 's no reason why he wanted to change his name ''
Emir Muaz , a Dagestan insurgent fighting in the Caucasus region , was killed in action . " Tsarnaev filed suit seeking using the fighter 's last name as his first name . Official to CNN : ` ` There 's no reason why he wanted to change his name ''