These were our requirements:

U-173/U Two-Pin Connector

10-year shelf life when stored correctly (see below)

you can’t just wear your normal glasses with a military gas mask

MIRA Safety® Tactical Side Plates – Level 4 detection These were our requirements:Important Note: This item cannot be purchased by anyone who has a violent felony conviction, cannot be shipped to any address in Connecticut or New York, and cannot be shipped internationally (US only). Key Features of MIRA Tactical Level 4 Side Plates MIRA Safety's Level 4 Side Plates offers ultimate defense against high caliber, armor piercing rounds. Stops armor piercing rounds. Advanced composite materials for superior strength and durability