Looks like it covers you from entry into military service as well. This is all going to be in section 3955 of the act. If you look at a(1)(A) it states that you can generally terminate a lease after entry into military service. The law further defines military service here 50 USC § 3911(2), where it references title 10 orders under 101(d)(1), which is pretty inclusive: "includes full-time training duty, annual training duty, and attendance, while in the active military service, at a school designated as a service school by law or by the Secretary of the military department concerned"
b(2)(A) of 3955 of the SCRA specifically refers to motor vehicle leases, and specifies that if you subsequently enter military service for 180+ days under a call or order you should be all set. Your orders should satisfy this. The procedure to terminate the lease is laid out in subsection "c" of Section 3955 of the SCRA. So make sure you follow that to the "T" when you go to do it, probably wouldn't hurt to bring in the legal references as well. I'm sure there's a better write-up in google land than I just did.