Today in WW II: 6 Apr 1941 Operation Marita: Germans invade Greece. More 
6 Apr 1941 Axis armies from Germany, Italy, and Bulgaria invade Yugoslavia; Luftwaffe bombs Belgrade.
6 Apr 1945 Yugoslav Partisans liberate Sarajevo from the troops of Nazi Germany who then withdraw from Bosnia.
6 Apr 1945 Japanese battleship Yamato and supporting ships sunk 200 miles [320 km] north of Okinawa while enroute there to relieve increasingly desperate defenders [6-7 Apr].
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International Harvester TD-20 Tractor / Bulldozer

The International Harvester TD-20 Tractor / Bulldozer was the successor to the IH TD-18 used during World War II. The IH TD-20 was introduced in 1958, replacing the last upgraded model of the TD-18. The TD-20 was produced in several models including the TD-20B, TD-20C, TD-20E, and TD-20H. In addition to International Harvester, the TD-20 has been produced by Dresser, HSW, and Dressta as they successively took over the original IH line of tracked vehicles starting in 1982. The TD-20H continues to be marketed by Dressta in the mid 2000s.

The IH TD-20 tractor is powered by a 691 cid 6 cyl diesel engine producing 110 drawbar hp, mated to a 6 speed transmission.

The military nomenclature for the IH TD-20 is Tractor, Full Tracked, Low Speed, NSN 2410-00-928-7491.

International Harvester TD-20 Bulldozer photographed during construction at Phu Cat Air Base, Vietnam. April 1967, operated by member of the 819th RED HORSE Squadron, USAF.  Thanks to Ron Nash for correct ID.
International Harvester TD-20 Bulldozer photographed during construction at Phu Cat Air Base, Vietnam. April 1967, operated by member of the 819th RED HORSE Squadron, USAF. Thanks to Ron Nash for correct ID.