infantryman (n.)

• ambulator
• backpacker
• carabineer
• footslogger
• grenadier
• grunt
• hiker
• hitchhiker
• hoofer
• jaywalker
• marcher
• marksman
• musketeer
• pedestrian
• peripatetic
• rifle
• rifleman
• sharpshooter
• sniper
• tramper
• walker