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.
MRA+10 Retirement. FERS employees are eligible for a retirement annuity at the Minimum Retirement Age (MRA) with just 10 years of service. However, if you retire at the Minimum Retirement Age (MRA) with 10 service, but less than 30 years of service, your benefit will be reduced by the age reduction.