SASEBO NAVAL BASE, Japan — The Marine Corps soon will offer early retirement with benefits to some troops as part of force-shaping efforts aimed at cutting 20,000 jobs from the rolls over the next four years, Corps officials said this week. Under the plan, expected to start this fall, Marines and officers with 15-20 years of service will be offered early retirement with benefits. It’s part of a larger Marine initiative that includes voluntary early discharges and the convening of a selective early retirement board for lieutenant colonels and colonels already eligible for 20-year retirement benefits, who have stagnated in...