Eligibility is limited to those who have been employed at designated shipyards for at least 5 years, but who are not yet eligible for retirement benefits.
 Eligibility is limited to those who have been employed at designated shipyards for at least 5 years
mnli hypothesis:  Eligibility is limited to those who have been employed at designated shipyards for at least 5 years premise: Eligibility is limited to those who have been employed at designated shipyards for at least 5 years, but who are not yet eligible for retirement benefits.