[mmrk]

For skin you could do it with PVar's like this:

pawn Code:

dcmd_onduty(playerid,params[])
{
    #pragma unused params
    if (AccInfo[playerid][Level] >= 1)
    {
        if(AccInfo[playerid][OnDuty] == 0)
        {
            SetPVarInt(playerid, "Skin", GetPlayerSkin(playerid)); // added
            
            AccInfo[playerid][OnDuty] = 1;
            SetPlayerHealth(playerid,100000);
            SetPlayerSkin(playerid,294);
            GivePlayerWeapon(playerid,16,50000);
            GivePlayerWeapon(playerid,38,50000);
            return SendClientMessage(playerid,green,"You are now in Duty Mode");
        }
        else
        {
            SetPlayerSkin(playerid, GetPVarInt(playerid, "Skin")); // Added
            
            AccInfo[playerid][OnDuty] = 0;
            SetPlayerHealth(playerid,100);
            return SendClientMessage(playerid,orange,"You are now Off Duty");
            
        }
    }
    return ErrorMessages(playerid, 5);
}