1. Employee Contributions vs. Employer Contributions
This plan likely includes both. Employee contributions are always 100% vested. However, employer contributions may be subject to a vesting schedule — meaning not all benefits earned during the marriage are legally divisible.
The QDRO needs to clarify whether the alternate payee receives a portion of only the vested account balance or also future vesting (depending on what you agree to in the divorce). Overlooking this leads to disputes and delays in approval by the plan administrator.

