One way to categorize waves is to say that there are longitudinal and transverse waves. In a transverse wave, particles of the medium are displaced in a direction perpendicular to the direction of energy transport. In a longitudinal wave, particles of the medium are displaced in a direction parallel to energy transport.
Seven plans allowed normal retirement within these ages. Six of them required at least 30 years of service for normal retirement. Only two of the plans continue to allow normal retirement within these ages. Both now require a minimum age of 57 and at least 30 years of service. For most plans the minimum age requirement increased to the range of age 60 to age 62. Age 60.
Under FERS, you must have at least five years of creditable civilian service to be eligible for an annuity and be covered by the retirement system on the day of separation. Exception: The service requirement for disability retirement is 18 months. To qualify for an immediate retirement you must meet age and service requirements as follows: