Earnings rose at Amentum [AMTM] in the past quarter, which the company attributed to “tailwinds” in nuclear power and defense, the company reported on Monday evening. This is Amentum’s first year as a publicly traded company. Net earnings for the quarter ended Oct. 3 were $3.9 billion, or 16 cents per share, up from $3.5 billion, or 28 cents a share, in the year-ago quarter. Quarterly revenue was $135 million, a five-fold increase from $27 million a year ago, according…