National changes allow governing bodies to adapt one or more specific rule changes in order to be more flexible in organization, whilst retaining the core elements of the rules.
The organizer of a game/tournament/championship may change one or more rules as follows:

Flag Football and Flag 7 on 7

R 1-1-1 Field dimensions can be changed due to game site or age.

The width and length of a half of the field of play can be uniformly increased or decreased by up to 5 yards. Length changes should be made relative to the middle of the field (e.g. if five yards are to be added, each half should be 27.5 yards long plus end zones). NOTE: Maximum regular field of play is 60 yd (54,90 m) x 30 yd (27,45 m), minimum is 40 yd (36,60 m) x 20 yd (18,30 m). Maximum width for big field is 35 yd (32,05 m), minimum is 25 yd (22,90 m). The proportions of each half should continue to correspond approximately to a square, or the corresponding rectangle for Flag 7 on 7. End zones may be shortened to a minimum of 8 yd (7,30 m).
Safety area may not be altered.

R 1-1-1 Minimum field markings may be side lines, goal lines and end lines.
R 1-1-1 Pylons or disk markers may only be recommended.
R 1-1-1 Down indicator may only be recommended.
R 1-1-1 Score board may only be recommended.
R 1-1-1 Team rosters may consist of more than 15 players.
R 1-1-1 Teams may have players of different gender.
R 1-1-4 Officials may only be recommended.
R 1-2-1 Game balls need not be leather.
R 1-2-2 In mixed games youth ball size may be used.
R 1-3-1 Flags need not be pop-flags in youth and junior games.
R 1-3-1 Mouthpieces may be made mandatory.
R 1-3-2 Head wear may be legal, provided it does not endanger or offend other players.
R 3-1-4 The organizer of a tournament may decide the order of teams if the tie breaker system is not deemed appropriate, but the officially designated system is strongly recommended due to its fairness and ease of use.
R 3-2-1 Playing time may be altered due to competition or age.
R 3-2-5 The period where the timing restrictions of Rule 3-2-5 are in effect may be reduced from 2 to 1 minute.
R 3-3-2 Number of Timeouts may be changed.

Beach Flag (in addition to Flag Football changes)

R 1-1-1 Field dimensions may be altered due to game site or age in the same way as at Flag Football.
NOTE: Maximum small field is 30 x 30 yd (27,45 m), minimum is 20 x 20 yd (18,30 m).
R 1-1-1 Marking of the field may be done with pylons or disk markers.
R 1-1-1 Team rosters may consist of more than 10 players.
R 5-1-1 Number of downs may be reduced to 3.

Other rules may not be altered for competition games.
It is strongly recommended not to alter these rules and play a different game at non-competition games.