Heave Ho!

Heave Ho! is a Fallout, Fallout 2 and Fallout Tactics Perk.
 * Requirements: Level 6, ST < 9
 * Ranks: 3 (1 in patched Fallout 2)
 * Benefit: Each level of this perk gives you an additional +2 to Strength for purposes of determining range with thrown weapons only. This Perk will not exceed a weapon's maximum range.

Range is calculated as 3 * ST. Since grenades have a maximum range of 15, this perk is useless unless your strength is 3 or less.