I am the only one I've heard bring this up, and it is not the intent of the SCRA, but the SCRA has been modified perhaps to the point of unintended consequences. So let's discuss this here, just between us.
"Military service" is defined by 10 USC 101,
https://www.law.cornell.edu/uscode/text/10/101 and it includes annual training duty. So a reservist going to summer camp is in the military service.
The national guard member has the "for a period of more than 30 days" that Randy mentioned, BUT 3917 which is about a reservist being called up has no such reference and says the reservist is protected as of the date they get their orders until discharged (2 weeks in this scenario, right?) They are immediately protected under subsections I, II and III of the SCRA which includes the 6% rule. Not only the 6% rule, but the added protection that extends for a year after active duty on mortgage loans. This could effectively extend a mortgage rate decrease until the next year's summer camp. Sounds like shampooing your hair, rinse and repeat.
https://www.bankersonline.com/regulations/scra-3917 and (3937(a)(2) )
https://www.bankersonline.com/regulations/scra-527 .
I've questioned this for some time and don't see why it doesn't apply.