12/335, Lieutenant, 1st Battalion, Auckland Regiment, WW1
6133, Lieutenant Colonel, 28th (Maori) Battalion, New Zealand Infantry, WW2
30281, Brigadier, Central Military District, New Zealand Military Forces

Member of the Most Excellent Order of the British Empire (MBE) military div
Gazetted 31 May 1935, p3603

Commander of the Most Excellent Order of the British Empire (CBE) military div
Gazetted 28 December 1945, p17
For services to the Nation of Fiji.

Distinguished Service Order
New Zealand Gazette, 26 December 1941, p7334
For gallant leadership.  This officer commanded the 28th (Maori) Battalion and in both Greece and Crete rendered conspicuous service to the Division.  In Greece his Battalion held a line 5000 yards in length and was attacked along the whole of its length.  Despite the fact that its line was penetrated at several points the unit made a series of determined counterattacks, restored the position, and then made its withdrawal.  The success was due to the leadership of Lt Col Dittmer.  In the operations in Crete the 28th Battalion established a proud record.  It counter attacked the enemy on at least five occasions; inflicting heavy losses each time.  It took the largest share of rearguard work and right to the end asserted its superiority over the enemy on the ground, and in every one of its engagements was led by its commanding officer, Lt Col Dittmer.

Military Cross
Gazetted 4 June 1917, p5486
Period: 21 September 1916 to 28 February 1917. This officer left New Zealand as a Private. He has the best record for steady service in the Battalion, he has never been absent for a day save on duty or leave.  No action of his stands out vividly as an example of steady bravery in action, and daily punctual devotion to duty.  After September he commanded his company at the Somme.

Commander of the Most Excellent Order of the British Empire (CBE)
Distinguished Service Order
Military Cross
1914-15 Star
British War Medal
Victory Medal
1939-45 Star
Africa Star
Pacific Star
Defence Medal
War Medal 1939-45
New Zealand War Service Medal
New Zealand Long and Efficient Service Medal
New Zealand Territorial Service Medal

Born 4 June 1893, Maharahara, Hawkes Bay, New Zealand
Died 11 August 1979, Auckland, New Zealand
Buried at Kauae Cemetery, Ngongataha, Rotorua, New Zealand