they usually choose the elite, deadly navy s.e.a.l.s. >> i estimate for every living s.e.a.l. and there is about 9,000 of us on this planet, that we each carry about 1,000 imposters on our back. >> reporter: it is so common that there a youtube blog phony s.e.a.l. of the week. >> there are people watching tonight sitting next to a person that they believe is it a navy s.e.a.l. oig. their husband, father, brother. this guy next to me is a navy s.e.a.l. and he is not. >> reporter: robert only stepped down as chief. he's still a commander in the waukegan police force. because of the first amendment, it's not illegal to lie about your military service. but the stolen valor act signed in june makes it a crime to profit from that lie. shannon, back to you. >> mike, thank you. investigators in arizona are trying to determine where 19 members of an elite firefighting unit were killed sunday.