RealWear has a good noise-cancellation feature and a fully-rugged head-mounted device, it optionally snaps into safety helmets or attaches to bump caps and can be used with safety glasses or corrective eyewear. 

Vuzix is also suitable for field operations and it has similar features to RealWear. 

Epson Moverio smart glasses provide a wide screen to the users, which for instance, can be beneficial during training operations.