Style Guide for NASA History Authors and Editors

> Define frequently used acronyms upon first usage. Try to avoid excessive use of acronyms, which is a plague of bureaucratic writing and speech.

e.g.:

> The space shuttle system consists of four primary elements: an orbiter spacecraft, two solid rocket boosters (SRBs), an external tank (ET) to house fuel and oxidizer, and three space shuttle main engines (SSMEs). The shuttle can transport payloads into near Earth orbit 100 to 312 nm above the Earth. Payloads are carried in a bay 15 feet in diameter and 60 feet long. Major system requirements are that the orbiter and the two SRBs be reusable.([0], 1.1-1)

NASA really loves acronyms.

[0]:https://www.nasa.gov/centers/johnson/pdf/390651main_shuttle_...