Deductions & credits

The DOD publishes per diem rates for Alaska, Hawaii, etc.. It gives rates for 'Max Lodging, Local Meals, Proportioned Meals, Local Incidental and a Max Perdiem' which is the total of lodging, meals and incidentals. So are you saying that we cannot use the posted rate on our Federal Income tax return? I worked as a construction worker there for 2 months until the job was completed.