The U.S. Navy recognizes this company's artificial intelligence (AI) solutions as a possible asset, and investors are taking note. Poised to post its 10th consecutive day of closing higher than the day before, BigBear.ai (BBAI 12.78%) stock roared out of the gate this morning. Is BigBear.ai stock a buy now? While today's news from BigBear.ai is encouraging, it's important to recognize that it's not really moving the needle for the company. With both BigBear.ai and Palantir stock soaring recently, cautious investors looking for AI stocks specializing in defense solutions may want to consider a defense ETF as a way to mitigate the risk of an individual stock experiencing a sell-off.