I take medications that mess with my memory and I'm aware of Aleppo. I can understand how he'd be confused and think it's an agency or an acronym but a presidential candidate should probably know what Aleppo is.
I wish I thought that Trump had only been smoking weed, because that would mean the insanity might pass.
Take your pick of his craziest antic: claiming in a rally that Secretary Clinton could shoot someone in the heart right there and not be prosecuted; criticizing the US on Russian TV; or saying he would fire on small Iranian boats if they made disrespectful gestures at a US ship.
Rachel Maddow's team did some research. Trump has never once mentioned Aleppo. Since he doesn't know about Crimea or Ukraine, presumably he thinks it is a dog food. It's a pity he wasn't asked.