The Victorinox One-Hand Fireman Swiss Army knife is a hefty knife designed for firemen or volunteers. It includes a thumb release button for the locking blade, and it's a good general purpose knife as well.

Fireman-- no lock release button, plain blade
Fireman One-Hand Original-- plain blade, smaller bottle opener
Jumpmaster-- no lock release button, phillips screwdriver instead of corkscrew
One-Hand Parachutist-- no wood saw, phillips screwdriver instead of corkscrew