Final answer:
A soldier who has completed all readiness requirements except for waiting on mask inserts would be placed in Medical Readiness Class 1, indicating they are ready for deployment.
Step-by-step explanation:
If a soldier has completed all individual readiness requirements and is only waiting for mask inserts, they would typically be placed in Medical Readiness Class (MRC) 1. MRC 1 categorizes soldiers who are deemed medically ready for deployment, having fulfilled all medical, dental, and administrative requirements. The absence of mask inserts is generally considered a minor issue that can be resolved quickly, without affecting the soldier's overall readiness status.