A 45-year-old male reports drinking 6-8 beers daily for the past 5 years. He often drinks more than he intends to and has tried to cut down multiple times but cannot. He has developed tolerance (needs more to feel the same effect), spends significant time obtaining and recovering from alcohol, and has continued drinking despite a DUI and his wife threatening divorce. He has not experienced withdrawal symptoms. He still works full-time. How is his alcohol use disorder classified per DSM-5?