diff --git a/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala b/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala
index f8f02e3e..97f58318 100644
--- a/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala
+++ b/common/src/main/scala/net/psforever/packet/GamePacketOpcode.scala
@@ -592,7 +592,7 @@ object GamePacketOpcode extends Enumeration {
     case 0xe4 => noDecoder(MissionActionMessage)
     case 0xe5 => noDecoder(MissionKillTriggerMessage)
     case 0xe6 => noDecoder(ReplicationStreamMessage)
-    case 0xe7 => noDecoder(SquadDefinitionActionMessage)
+    case 0xe7 => game.SquadDefinitionActionMessage.decode
     // 0xe8
     case 0xe8 => noDecoder(SquadDetailDefinitionUpdateMessage)
     case 0xe9 => noDecoder(TacticsMessage)
diff --git a/common/src/main/scala/net/psforever/packet/game/SquadDefinitionActionMessage.scala b/common/src/main/scala/net/psforever/packet/game/SquadDefinitionActionMessage.scala
new file mode 100644
index 00000000..8ef3a3dc
--- /dev/null
+++ b/common/src/main/scala/net/psforever/packet/game/SquadDefinitionActionMessage.scala
@@ -0,0 +1,292 @@
+// Copyright (c) 2016 PSForever.net to present
+package net.psforever.packet.game
+
+import net.psforever.packet.{GamePacketOpcode, Marshallable, PacketHelpers, PlanetSideGamePacket}
+import scodec.{Attempt, Codec, Err}
+import scodec.codecs._
+import shapeless.{::, HNil}
+
+final case class SquadDefinitionActionMessage(action : Int,
+                                              unk2 : Int,
+                                              unk3 : Int,
+                                              unk4 : Option[String],
+                                              unk5 : Option[Int],
+                                              unk6 : Option[Int],
+                                              unk7 : Option[Long],
+                                              unk8 : Option[Long],
+                                              unk9 : Option[Boolean])
+  extends PlanetSideGamePacket {
+  type Packet = SquadDefinitionActionMessage
+  def opcode = GamePacketOpcode.SquadDefinitionActionMessage
+  def encode = SquadDefinitionActionMessage.encode(this)
+}
+
+object SquadDefinitionActionMessage extends Marshallable[SquadDefinitionActionMessage] {
+  private type allPattern = Option[String] :: Option[Int] :: Option[Int] :: Option[Long] :: Option[Long] :: Option[Boolean] :: HNil
+
+  def boolCodec : Codec[allPattern] = bool.hlist.exmap[allPattern] (
+    {
+      case n :: HNil =>
+        Attempt.successful(None :: None :: None :: None :: None :: Some(n) :: HNil)
+    },
+    {
+      case _ :: _ :: _ :: _ :: _ :: None :: HNil =>
+        Attempt.failure(Err("expected a boolean value but found nothing"))
+      case _ :: _ :: _ :: _ :: _ :: Some(n) :: HNil =>
+        Attempt.successful(n :: HNil)
+    }
+  )
+
+  def intCodec(icodec : Codec[Int]) : Codec[allPattern] = icodec.hlist.exmap[allPattern] (
+    {
+      case n :: HNil =>
+        Attempt.successful(None :: Some(n) :: None :: None :: None :: None :: HNil)
+    },
+    {
+      case _ :: None :: _ :: _ :: _ :: _ :: HNil =>
+        Attempt.failure(Err("expected an integer value but found nothing"))
+      case _ :: Some(n) :: _ :: _ :: _ :: _ :: HNil =>
+        Attempt.successful(n :: HNil)
+    }
+  )
+
+  def longCodec : Codec[allPattern] = uint32L.hlist.exmap[allPattern] (
+    {
+      case n :: HNil =>
+        Attempt.successful(None :: None :: None :: Some(n) :: None :: None :: HNil)
+    },
+    {
+      case _ :: _ :: _ :: None :: _ :: _ :: HNil =>
+        Attempt.failure(Err("expected a long value but found nothing"))
+      case _ :: _ :: _ :: Some(n) :: _ :: _ :: HNil =>
+        Attempt.successful(n :: HNil)
+    }
+  )
+
+  def stringCodec : Codec[allPattern] = PacketHelpers.encodedWideStringAligned(6).hlist.exmap[allPattern] (
+    {
+      case a :: HNil =>
+        Attempt.successful(Some(a) :: None :: None :: None :: None :: None :: HNil)
+    },
+    {
+      case None:: _ :: _ :: _ :: _ :: _ :: HNil =>
+        Attempt.failure(Err("expected a string value but found nothing"))
+      case Some(a) :: _ :: _ :: _ :: _ :: _ :: HNil =>
+        Attempt.successful(a :: HNil)
+    }
+  )
+
+  def intLongCodec(lcodec : Codec[Long]) : Codec[allPattern] = (
+    uint4L ::
+      lcodec
+    ).exmap[allPattern] (
+    {
+      case a :: b :: HNil =>
+        Attempt.successful(None :: Some(a) :: None :: Some(b) :: None :: None :: HNil)
+    },
+    {
+      case _ :: None :: _ :: _ :: _ :: _ :: HNil =>
+        Attempt.failure(Err("expected a integer value but found nothing"))
+      case _ :: _ :: _ :: None :: _ :: _ :: HNil =>
+        Attempt.failure(Err("expected a long value but found nothing"))
+      case _ :: Some(a) :: _ :: Some(b) :: _ :: _ :: HNil =>
+        Attempt.successful(a :: b :: HNil)
+    }
+  )
+
+  def intStringCodec : Codec[allPattern] = (
+    uint4L ::
+      PacketHelpers.encodedWideStringAligned(2)
+    ).exmap[allPattern] (
+    {
+      case a :: b :: HNil =>
+        Attempt.successful(Some(b) :: Some(a) :: None :: None :: None :: None :: HNil)
+    },
+    {
+      case None:: _ :: _ :: _ :: _ :: _ :: HNil =>
+        Attempt.failure(Err("expected a string value but found nothing"))
+      case _ :: None :: _ :: _ :: _ :: _ :: HNil =>
+        Attempt.failure(Err("expected an integer value but found nothing"))
+      case Some(b) :: Some(a) :: _ :: _ :: _ :: _ :: HNil =>
+        Attempt.successful(a :: b :: HNil)
+    }
+  )
+
+  def longLongCodec : Codec[allPattern] = (
+    ulongL(46) ::
+      uint32L
+    ).exmap[allPattern] (
+    {
+      case a :: b :: HNil =>
+        Attempt.successful(None :: None :: None :: Some(a) :: Some(b) :: None :: HNil)
+    },
+    {
+      case (_ :: _ :: _ :: None :: _ :: _ :: HNil) | (_ :: _ :: _ :: _ :: None :: _ :: HNil) =>
+        Attempt.failure(Err("expected two long values but found one"))
+      case _ :: _ :: _ :: Some(a) :: Some(b) :: _ :: HNil =>
+        Attempt.successful(a :: b :: HNil)
+    }
+  )
+
+  def complexCodec : Codec[allPattern] = (
+    PacketHelpers.encodedWideStringAligned(6) ::
+      ulongL(46) ::
+      uint16L ::
+      uintL(3)
+    ).exmap[allPattern] (
+    {
+      case a :: b :: c :: d :: HNil =>
+        Attempt.successful(Some(a) :: Some(c) :: Some(d) :: Some(b) :: None :: None :: HNil)
+    },
+    {
+      case None:: _ :: _ :: _ :: _ :: _ :: HNil =>
+        Attempt.failure(Err("expected a string value but found nothing"))
+      case _ :: _ :: _ :: None :: _ :: _ :: HNil =>
+        Attempt.failure(Err("expected a long value but found nothing"))
+      case (_ :: None :: _ :: _ :: _ :: _ :: HNil) | (_ :: _ :: None :: _ :: _ :: _ :: HNil) =>
+        Attempt.failure(Err("expected two integer values but found one"))
+      case Some(a) :: Some(c) :: Some(d) :: Some(b) :: _ :: _ :: HNil =>
+        Attempt.successful(a :: b :: c :: d :: HNil)
+    }
+  )
+
+  import scala.annotation.switch
+  def select_codec(action : Int) : Codec[allPattern] = (action : @switch) match {
+    case 28 | 29 | 30 | 31  =>
+      boolCodec
+
+    case 33 =>
+      intCodec(uintL(3))
+    case 10 | 11 | 21 | 22 | 40 =>
+      intCodec(uint4L)
+    case 20 =>
+      intCodec(uint16L)
+
+    case 13 | 14 | 15 | 37 =>
+      longCodec
+
+    case 7 | 19 =>
+      stringCodec
+
+    case 12 | 38 =>
+      intLongCodec(uint32L)
+    case 25 =>
+      intLongCodec(ulongL(46))
+
+    case 23 | 24 =>
+      intStringCodec
+
+    case 36 =>
+      longLongCodec
+
+    case 34 =>
+      complexCodec
+
+    case _ =>
+      //TODO for debugging purposes only
+      bits.hlist.exmap[allPattern] (
+        {
+          case x :: HNil =>
+            org.log4s.getLogger.warn(s"can not match a codec pattern for decoding $action")
+            Attempt.successful(Some(x.toString) :: None :: None :: None :: None :: None :: HNil)
+        },
+        {
+          case Some(x) :: None :: None :: None :: None :: None :: HNil =>
+            org.log4s.getLogger.warn(s"can not match a codec pattern for encoding $action")
+            Attempt.successful(scodec.bits.BitVector.fromValidBin(x) :: HNil)
+        }
+      )
+//      ignore(0).exmap[allPattern] (
+//        {
+//          case () =>
+//            Attempt.failure(Err(s"can not match a codec pattern for decoding $test"))
+//        },
+//        {
+//          case _ =>
+//            Attempt.failure(Err(s"can not match a codec pattern for encoding $test"))
+//        }
+//      )
+  }
+
+  implicit val codec : Codec[SquadDefinitionActionMessage] = (
+    ("action" | uintL(6)) >>:~ { action =>
+      ("unk2" | uint16L) ::
+        ("unk3" | uint4L) ::
+        select_codec(action)
+//        conditional(unk1 == 7, "unk4" | PacketHelpers.encodedWideStringAligned(6)) ::
+//        conditional((unk1 > 9 && unk1 < 13) || (unk1 > 20 && unk1 < 26) || unk1 == 38 || unk1 == 40, "unk5" | uint4L) ::
+//        conditional(unk1 == 23 || unk1 == 34, "unk6" | PacketHelpers.encodedWideStringAligned(4)) ::
+//        conditional(unk1 == 25 || unk1 == 34 || unk1 == 36, "unk7" | ulongL(46)) ::
+//        conditional(unk1 == 19, "unk8" | PacketHelpers.encodedWideStringAligned(2)) :: //goto LABEL_49
+//        conditional(unk1 == 20 || unk1 == 34, "unk9" | uint16L) :: //goto LABEL_48
+//        conditional(unk1 == 24, "unkA" | PacketHelpers.encodedWideString) :: //goto LABEL_49
+//        conditional((unk1 > 11 && unk1 < 16) || (unk1 > 35 && unk1 < 39), "unkB" | uint32L) :: //goto LABEL_49
+//      //LABEL_48
+//        conditional(unk1 > 27 && unk1 < 32, "unkC" | bool) :: //goto LABEL_49
+//        conditional(unk1 == 33, "unkD" | uintL(3)) ::
+//      //LABEL_49
+//        conditional(unk1 == 34, "unkE" | uintL(3))
+    }
+    ).as[SquadDefinitionActionMessage]
+}
+
+/*
+("change" specifically indicates the perspective is from the SL; "update for squad member" actions may be different)
+("[#]" indicates the mode is detected but not properly parsed; the length of the combined fields may follow
+
+[0] - clicking on a squad listed in the "Find Squad" tab / cancel squad search
+[3] - save sqad favorite (6 bits)
+[4] - load a squad definition favorite (6 bits)
+7  -
+[8] - list squad (6 bits)
+10 - select this role for yourself
+11 -
+12 -
+13 -
+14 -
+15 -
+19 - change purpose
+20 - change zone
+21 - change/close squad member position
+22 - change/add squad member position
+23 - change squad member req role
+24 - change squad member req detailed orders
+25 - change squad member req weapons
+[26] - reset all (6 bits)
+28 - auto-approve requests for invitation
+29 -
+30 -
+31 - location follows squad lead
+33 -
+34 - search for squads with a particular role
+36 -
+37 -
+38 -
+40 - find LFS soldiers that meet the requirements for this role
+[41] - cancel search for LFS soldiers (6 bits)
+
+28 - 1u (Boolean)
+29 - iu (Boolean)
+30 - 1u (Boolean)
+31 - 1u (Boolean)
+33 - 3u (Int)
+10 - 4u (Int)
+11 - 4u (Int)
+21 - 4u (Int)
+22 - 4u (Int)
+40 - 4u (Int)
+20 - 16u (Int)
+13 - 32u (Long)
+14 - 32u (Long)
+15 - 32u (Long)
+37 - 32u (Long)
+7  - String(6) (String)
+19 - String(6) (String)
+12 - 4u + 32u (Int :: Long)
+38 - 4u + 32u (Int :: Long)
+25 - 4u + 46u (Int :: Long)
+23 - 4u + String(2) (Int :: String)
+24 - 4u + String(2) (Int :: String)
+36 - 46u + 32u (Long :: Long)
+34 - String(6) + 46u + 16u + 3u (String :: Long :: Int :: Int)
+  */
\ No newline at end of file
diff --git a/pslogin/src/main/scala/WorldSessionActor.scala b/pslogin/src/main/scala/WorldSessionActor.scala
index 6652cd55..21ffcb62 100644
--- a/pslogin/src/main/scala/WorldSessionActor.scala
+++ b/pslogin/src/main/scala/WorldSessionActor.scala
@@ -332,6 +332,9 @@ class WorldSessionActor extends Actor with MDCContextAware {
     case msg @ AvatarGrenadeStateMessage(player_guid, state) =>
       log.info("AvatarGrenadeStateMessage: " + msg)
 
+    case msg @ SquadDefinitionActionMessage(a, b, c, d, e, f, g, h, i) =>
+      log.info("SquadDefinitionAction: " + msg)
+
     case default => log.debug(s"Unhandled GamePacket ${pkt}")
   }