20880302_ferences__July_2014_FIDE_Laws___FIDE_rule
[0] 11. [USCF rule] This rule does not exist in the Official Rules of Chess. Addition of this rule is proposed for the 2014 Delegates' Meeting (August 2-3, 2014). [FIDE rule] 
The game is drawn without either player making a claim if the same position occurs on the board after five consecutive pairs of moves for each player ("five-fold repetition") or if both players have completed 75 moves without a capture or a pawn move.
The United States Chess Federation - USCF - FIDE Rule Differences (July 2014 FIDE Laws)
FIDE rule