At an annual physical for work 45 yr old husband had spot in lung did ct 3cm mass in right middle lobe. 25 yr smoker military exposure to asbestos ?

Sorry to hear this: Unfortunately it's not clear what your question is. Nonetheless, with a lung mass of that size, your husband needs to have this evaluated sooner rather than later, which will likely require a pulmnologist(lung doctor)/radiologist or thoracic surgeon to get a sample and a medical oncologist. If you have a more specific question please rephrase it so that we can more readily answer a question.

Unfortunately: this will likely need a biopsy to evaluate for lung cancer.