E4

E4, E.IV or E-4 may refer to:

Entertainment

Transportation

Roads

Trains

Military

Enlisted rank

An enlisted rank (also known as an enlisted grade or enlisted rate) is, in some armed services, any rank below that of a commissioned officer. The term can be inclusive of non-commissioned officers or warrant officers, except in United States military usage where warrant officers/chief warrant officers are a separate officer category ranking above enlisted grades and below commissioned officer grades. In most cases, enlisted service personnel perform jobs specific to their own occupational specialty, as opposed to the more generalized command responsibilities of commissioned officers. The term "enlistment" refers solely to a military commitment (whether officer or enlisted) whereas the terms "taken of strength" and "struck off strength" refer to a servicemember being carried on a given unit's roll.

Canadian Forces

In the Canadian Forces, the term non-commissioned member (NCM) is used.

North Atlantic Treaty Organization

For the ranks used by the North Atlantic Treaty Organization, non-commissioned ranks are coded OR1–OR9 (bottom to top), OR being an abbreviation for Other Ranks.

Chang'e 4

Chang'e 4 (Chinese: 嫦娥四号; pinyin: Cháng'é sìhào) will be a Chinese lunar exploration mission, incorporating a robotic lander and rover. Chang'e 4 will be China's second lunar lander and rover, and built as a backup to Chang'e 3, as Chang'e 2 was to Chang'e 1. Following the successful landing of the Chang'e 3 mission, the configuration of Chang'e 4 will be adjusted to test equipment in advance of Chang'e 5. Like its predecessors, the spacecraft is named after the Chinese moon goddess Chang'e.

The mission was scheduled for launch in 2015 as part of the second phase of the Chinese Lunar Exploration Program but the adjusted design of the mission now means it will be before 2020. The adjusted aims will now include piloting a program that uses private investment from individuals and enterprises for the first time, a move aimed at accelerating aerospace innovation, cutting production costs and promoting military-civilian relationships.

An engineer from Chinese Academy of Sciences said the mission's objective would be to study geological conditions on the far side of the Moon. The potential landing spots include the Aitken Basin.