As Prodigy already mentioned, there are a variety of styles and people with the money to customize and a lack of rules to tell them not to would likely have the better gear. The military, being a government-associated bureaucracy, tends towards the lowest bidder for equipment, and issues it to everybody. I've seen exterminators with full-face-covering gas masks with a tiny compressed air tank, and I'd bet that there are other even better ones.
In Arsenal, the Bunker Helmet is mentioned as having integrated Thermographic, Low-light Vision, and Flare Compensation with a Gas Mask, so it's at least possible if you're going for a helm-type setup.