After completing DP1, Non-Commissioned Members (NCMs) are deemed occupationally employable at an introductory level. Occupational apartheid explains the reality that some people may be occupationally more equal than others. Young states that the disorder has significant effects socially, psychologically and occupationally. However, they are residentially and occupationally integrated, so lose more members to assimilation. Thaumatin powder led to allergic symptoms in the upper airways in occupationally exposed individuals. Arsenic is mainly encountered occupationally in the smelting of zinc and copper ores. Occupationally, workers can be exposed to vinclozolin while doing activities such as loading and mixing. Over twice that number (~22 million) are occupationally exposed to dangerous noise levels. The objective of such surveillance is to monitor for occupationally acquired diseases. Historian Dennis P. Ryan calls them "occupationally nearsighted". Occupationally, the Saurashtrians may be classified broadly as priests, merchants and weavers. In a study with sprayers that used methyl-S-demeton occupationally the health implications were assessed. Occupationally, urinary devices are used in the armed forces and other outdoor jobs. The curriculum consists of honor courses, college preparatory and occupationally related programs.