This NPC is a low-level grunt who is built to last for a while.
Tank CR 1
Male or Female Human Fighter 1
NE Medium Human (Human)
Init +2, Senses Listen +0; Spot +0
AC 24, touch 11, flat-footed 19 (+9 armor, +4 shield, +1 Dex)
hp 12 (1d10+2 HD)
Fort +4, Ref +2, Will +0
Spd 20 ft.
Melee Longsword +4 (1d8+2 / 19x2)
Base Atk +1; Grp +3
Space 5 ft.; Reach 5 ft.
Abilities Str 14 (+2), Dex 14 (+2), Con 14 (+2), Int 10 (+0), Wis 10 (+0), Cha 8 (-1)
Feats Heavy Armor Optimization, Shield Wall, Block Arrow
Skills ??
Possessions full plate armor, tower shield, longsword
Heavy Armor Optimization Races of Stone
Shield Wall (Heroes of Battle) +2 AC when next to another Tank (or someone with the Shield Wall feat)
Block Arrow Heroes of Battle