Yes......select active duty. And if this is in the My Info section, there will also be a follow-up question about whether you entered....or left the military service during 2020...so that becomes more accurate to your situation.
No...being deployed to Afghanistan is net treated as "working" outside of US. That statement is mostly for civilians. (might apply to Military based in say, Germany, where they worked an outside civilian job when off-duty...but only applies to the nonmilitary job)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*