There are times when you should request copies of your records: 1  Permanent Change of Station. 2  Deploying. 3  Retiring.
0. EXPERT ANSWER. Double coincidence of wants refers to a situation in a barter system where the goods or services offered by a seller are exactly the same as that required by a buyer and vice versa.
Double vision: Double vision can be due to an optical problem of the eye such as uncorrected astigmatism, or due to an eye alignment issue which can be caused by many problem including cranial nerve palsied, myasthenia, or a problem in the orbit such as thyroid eye disease or an orbital mass.