diff --git a/src/applications/project/controller/PhabricatorProjectBoardReorderController.php b/src/applications/project/controller/PhabricatorProjectBoardReorderController.php
--- a/src/applications/project/controller/PhabricatorProjectBoardReorderController.php
+++ b/src/applications/project/controller/PhabricatorProjectBoardReorderController.php
@@ -98,14 +98,11 @@
       ->setDrag(true);
 
     foreach ($columns as $column) {
-      // Don't allow milestone columns to be reordered.
+      // do allow milestone columns to be reordered.
       $proxy = $column->getProxy();
-      if ($proxy && $proxy->isMilestone()) {
-        continue;
-      }
 
       // At least for now, don't show subproject column.
-      if ($proxy) {
+      if ($proxy && !$proxy->isMilestone()) {
         continue;
       }
 
@@ -115,6 +112,8 @@
 
       if ($column->isHidden()) {
         $item->setDisabled(true);
+      } elseif($proxy && $proxy->isMilestone()) {
+        $item->setTitleText(pht('Milestone'));
       }
 
       $item->setGrippable(true);
diff --git a/src/applications/project/storage/PhabricatorProjectColumn.php b/src/applications/project/storage/PhabricatorProjectColumn.php
--- a/src/applications/project/storage/PhabricatorProjectColumn.php
+++ b/src/applications/project/storage/PhabricatorProjectColumn.php
@@ -168,22 +168,7 @@
   }
 
   public function getOrderingKey() {
-    $proxy = $this->getProxy();
-
-    // Normal columns and subproject columns go first, in a user-controlled
-    // order.
-
-    // All the milestone columns go last, in their sequential order.
-
-    if (!$proxy || !$proxy->isMilestone()) {
-      $group = 'A';
-      $sequence = $this->getSequence();
-    } else {
-      $group = 'B';
-      $sequence = $proxy->getMilestoneNumber();
-    }
-
-    return sprintf('%s%012d', $group, $sequence);
+    return $this->getSequence();
   }
 
   public function attachTrigger(PhabricatorProjectTrigger $trigger = null) {