what basd stand for in the army
Jupiterimages/Creatas/Getty Images. Basic Active Service Date (BASD), also known as Date Initially Entered Military Service, (DIEMS) is an important date for service members of all the military branches. The BASD is the date you use to calculate your time in Active Service (AS). Once you know that figure, you can then calculate your retirement pay and date of eligibility. For new service members, it can be difficult to find out your actual BASD. In many cases, it is not the date you began training.