Nope, can not get out at all as long as you are in employment covered by the retirement system.

New York State United Teachers was created in 1971.

NYSTRS is the second-largest public retirement system in the state and one of the 10-largest public funds in the nation based on portfolio size and total membership. We serve more than 273,000 active members and nearly 153,000 retirees and beneficiaries. Eligible retirees are guaranteed a monthly benefit payment for life.

NYSTRS administers a defined benefit plan that provides retirement, disability and death benefits to eligible New York State public school teachers and administrators. Eligibility for these benefits depends on factors such as a member's tier of membership, age, earnings and service credit.

The Retirement System was established in 1921 by the New York State Legislature, and our benefits are paid in accordance with the laws enacted by the Legislature.

One may find information about "New York State and Local Retirement System" (NYSLRS) by accessing the government website for New York and navigating to the "Work-Life Services" section. All program requirements and benefits are explained in detail.

I think it is suppose to be. Call them and ask.