According to the Society for Technical Communication (STC), the professions of technical communication and technical writing were first referenced around World War I, when technical documents became a necessity for military purposes. The job title emerged in the US during World War II, although it wasn't until 1951 that the first "Help Wanted: Technical Writer" ad was published. In fact, the title "Technical Writer" wasn't added to the US Bureau of Labor Statistic's Occupational Employment Handbook until 2010. During the 1940s and 50s, technical communicators and writers were hired to produce documentation for the military, often including detailed instructions on new weaponry. Other technical communicators and writers were involved in developing documentation for new technologies that were developed around this time. According to O'Hara: