It's about 9 o'clock in the morning, and already it's been a long day for Abu Anas. He's lost two men to a sniper serving the Syrian regime. Four more have been injured.
But Abu Anas walks with a striking calm through the bombed-out, ruined streets of Aleppo, a city that's been at war for months. He wears a black headband bearing Islam's holy creed: "There is no God but God. And Muhammad is his messenger."
Abu Anas commands a unit of Kataib Ahrar al-Sham, the Brigades of the Free People of Syria, a religious group that like other rebel groups wants to bring down President Bashar Assad's regime. But it's what it would do after that downfall that sets his and other Islamist groups apart.
Abu Anas believes that once the Syrian regime is toppled, a dawlet islamiyah, or state governed by Islamic law, should replace it. As far as he's concerned, that state would be one of peace and equality.
Kelly McEvers: What if other people don't want Islamic law? How are they going to reconcile that? How's that going to work?
Interpreter (speaking for Abu Anas): People are the ones who is going to decide. If the people doesn't want that, that's their decision.
It sounds fair enough, but Ahrar al-Sham isn't known for its tolerance. Aid kits for refugees include religious materials urging women to cover, and the group refused to meet with NPR's female interpreter until recently. That said the fact that Abu Anas is even talking to me, a foreigner and a non-Muslim, is something. That plus the fact that his group believes in the people's right to choose their leaders shows it's not the most hard-line Islamist group in this fight.
That honor falls to Jabhat al-Nusra, a much more secretive and violent group. The group doesn't meet the Western media. And though it claims to only attack military targets, its use of suicide bombings has killed scores of civilians as well. What's more, it's been approved and lauded by known al-Qaida figures online. Sources in Iraq tell NPR the group is linked to that country's branch of al-Qaida.
I ask Abu Anas if he believes in suicide attacks.
"I mean like they die daily, 200-300 Syrian people a day," he says through an interpreter. "So if giving away ... [my] life would save thousands of Syrians' lives, ... [I] would be ready to sacrifice ... [myself] to let the others live."
It's clearly a mixed picture. To call all these guys straight-up al-Qaida would be a mistake, but to call them warm, fuzzy democrats wouldn't be right, either.
These days, terrorism experts say, it's less about whether a group will launch suicide attacks and more about who gets the weapons.
Lately, Abu Anas' group and the more hard-line jihadists have worked side-by-side to take Syrian army bases and weapons with the less religious, more moderate rebels who call themselves the Free Syrian Army.
Some analysts say this was a calculated move on the part of the Islamists. Not only are they vying for weapons and power, but for the first time they are bowing to public pressure to be less extreme. Last month Islamist fighters released a video denouncing the political opposition that's working to bring down Assad. They later retracted the video after criticism from Syrian civilians.
Charles Lister, an analyst at IHS Jane's Terrorism and Insurgency Center, says the retraction was a good thing.
"However, that was a retraction of a video that came out while Assad is still in power and whilst they [the Islamist] have relatively little to lose," he says. "I think the situation could feasibly change if Assad was actually to fall. There'd be an awfully lot more to play for. And so I think some kind of tension is inevitable."
Secular rebel commanders have gone even further than that. One told me the next war will be against the Islamists. Another was cocky: If we can get rid of Assad, don't you think we can get rid of the Islamists?
But will it be so easy? By many accounts, the militant Islamist groups now number in the thousands, and growing every day.
It's another morning, and we're driving into Aleppo. The driver offers a friend a ride. The friend, Omar, is about 16. He sits next to me.
We find out Omar has just completed several weeks of training with Ahrar al-Sham, Abu Anas' group.
McEvers: what kind of training?
Omar (through an interpreter): Sports, shooting, taking care of your weapon.
McEvers: Is he pretty good with a Kalashnikov now?
Omar (through an interpreter): God willing.
It turns out this day is Omar's first day reporting to work.
Omar says he and his parents fled Syria after the regime's army shelled their village. They went to live in a refugee camp at the Turkish border. Omar's brother-in-law joined Ahrar al-Sham, so Omar figured he should join, too. We ask Omar why he wants an Islamic state.
McEvers: Would Syria change if it was an Islamic state, and how would it change?
Omar (through an interpreter): The government would stop killing people. It's the only way to get them to stop the killing. Beyond that I don't know. The rest of it is up to our leaders.