Re "Military Rethinks Axing Also-Rans," June 13: It sounds like such a good idea; keep those who can contribute to the armed forces after they've been passed over for promotion. Yet a number of items have been overlooked in the article: Congress establishes the number and grade of personnel in each of the armed forces. So if you retain an officer who has been passed over for promotion, he still counts against the number of authorized officers of that grade. That means that an officer in the next lower grade who is qualified for promotion cannot be promoted because there will be no opening. Those passed over have met the test of the Peter Principle and do not meet the future needs of the armed forces.