States laws generally allow active duty members of the United States armed forces to keep their residency in a different state than where they live for their military work while stationed around the country (or world). From the information you provided it would appear that your friend is taking advantage of this and has his license from his state of residence, which doesn't change, while he is stationed outside of that state by the military.

During his time in this other state he has received a DUI and wants to know if it will affect his home state license and insurance. Since most states are members of the Drivers License Compact or other reciprocal agreements it is most likely that the state in which he received the DUI will inform his home state (the state in which he is licensed in) of this violation.

Once the DUI is reported to his home state then it will normally be placed on his driving record. If the driving under the influence conviction does become part of his driving history then his auto insurance company would see this offense the next time they pulled his motor vehicle record (MVR) and thus his rates would be affected by this serious violation. How much will depend upon his insurance company's rating system.

The person that has received the DUI may want to seek legal counsel to find out what his options are since normally an offense like this will come with fines and other penalties such as license suspension. If your friend wishes to comparison shop for car insurance, he can get an insurance quote here with us.