An employer may use this policy when an employee has 2 weeks remaining until exhaustion of FMLA leave. While regulations do not require the employer to send such a notice, it is good practice and prevents an employee from claiming that they were unaware as to the expiration of their job protected leave.
This How To details the steps a prudent employer should take when reinstating an employee who returns from leave taken under the Uniformed Services Employment and Reemployment Rights Act (USERRA).