function dataValidation() {
var ss = SpreadsheetApp.getActiveSpreadsheet();
var Tr = ss.getRange("'Body Armor'!C2:C50").getValues(); //Testrange
// Variables and sheetnames
        var b = "'Body Armor'!";
        var g = "GS256!" ;
        var gC = "'GS256 Classified'!";
        var h = "B10:B27";
        var l = "B28:B36";
// Get DV ranges
        var gh = ss.getRange(g+h) ;
        var ghc = ss.getRange(gC+h);
        var gl = ss.getRange(g+l);
        var glc = ss.getRange(gC+l);
// Build DV rules
        var ghr = SpreadsheetApp.newDataValidation().requireValueInRange(gh,true);
        var ghcr = SpreadsheetApp.newDataValidation().requireValueInRange(ghc,true);
        var glr = SpreadsheetApp.newDataValidation().requireValueInRange(gl,true);
        var glcr= SpreadsheetApp.newDataValidation().requireValueInRange(glc,true);
// Loop through each cell
        for(i=0;i<Tr.length;i++) {
                var j = i+1;
                var Hr = ss.getRange(b+"H"+j);
                var Jr = ss.getRange(b+"J"+j);
                var Lr =  ss.getRange(b+"L"+j);
// Test the test range and apply corresponding DV
        if (Tr[i][0] == true) {
                Hr.setDataValidation(ghcr);
                Jr.setDataValidation(ghcr);
                Lr.setDataValidation(glcr);
                }
                else {
                Hr.setDataValidation(ghr);
                Jr.setDataValidation(ghr);
                Lr.setDataValidation(glr);
                }
        }
}

function onOpen() {
  var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  var menuItems = [
    {name: 'Gearset stats dropdown', functionName: 'onEdit'}
  ];
  spreadsheet.addMenu('Custom Functions', menuItems);
}

function onEdit(e) {
  dataValidation();
}