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.  The new Navigator 520 also has a wider screen.

Vuzix and Moziware Cimo 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.