new Duty[ MAX_PLAYERS ]

CMD:onduty(playerid, params[])
{
    if( Duty[ playerid ] == 0 )
    {
        Duty[ playerid ] = 1;
        SetPlayerSkin(playerid, 294);
        GivePlayerWeapon(playerid, 38, 999);
        
        // Get the player's skin and store it.
    }
    else
    {
        Duty[ playerid ] = 0;
        RemovePlayerWeapons(playerid);
        // Set the old players skin back.
    }
    return 1;
}