The Delta E was the second stage, with a Star 37D (Burner 2) third stage/apogee kick motor.

The new system could better accommodate the various changes and improvements to Delta rockets and avoided the problem of a rapidly depleting alphabet. There were 12 successful Delta M launches from 1968 until 1971.The Delta N combined a Long Tank Thor (MB-3-3 engine) first stage augmented with 3 Castor 2 boosters and a Delta E second stage.

These were respectively designated M6 or N6. Delta B could launch 200 pounds (91 kg) to GTO.For Delta C, the third stage Altair was replaced with Altair 2. Delta 3000 introduced the PAM (Payload Assist Module)/Star 48B solid-fueled kick motor, which was later used as Delta II third stage.The Delta 4000 and 5000 series were developed in the aftermath of the The Delta 5000 series featured upgraded Castor IVA motors on an Extended Long Tank first stage with the new RS-27 main engine and only launched one mission.The Delta 7000 series introduced the RS-27A main engine, which was modified for efficiency at high altitude at some cost to low-altitude performance, and the lighter and more powerful A McDonnell Douglas/Boeing-developed program to keep pace with growing satellite masses: The two-stage vehicle was used for 2 launches: Biosatellite 1 on 14 December 1966 and Biosatellite 2 on 7 September 1967.Delta L introduced the Extended Long Tank first stage with a uniform 8 feet (2.4 m) diameter and used the United Technologies FW-4D motor as a third stage.The Delta M first stage consisted of a Long Tank Thor with MB-3-3 engine augmented with 3 Castor 2 boosters. Delta D, also known as Thrust Augmented Delta, was a Delta C with the Thrust Augmented Thor core plus three The Delta G was a Delta E without the third stage. The digits specified (1) the tank and main engine type, (2) number of solid rocket boosters, (3) second stage (letters in the following table refer to the engine), and (4) third stage: The Altair 2 had been developed as the ABL X-258 for the Scout vehicle and was 3 in (76 mm) longer, 10% heavier, and with 65% more total thrust. Of the three Delta III flights, the first two were failures and the third carried only a dummy (inert) payload. In 1972, McDonnell Douglas introduced a four-digit numbering system to replace the letter-naming system. The first and only launch of the M6 configuration was Explorer 43 (IMP-H, Magnetospheric research) on 13 March 1971.From 1969 through 1978 (inclusive), Thor-Delta was NASA's most used launcher, with 84 launch attempts. With the Delta B the Delta program went from 'interim' to 'operational' status. These are strap-on boosters which are separated earlier in the flight than the center CBC.

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