 The request for exemption can be lightly distinguished from the request for rule modification. As indicated, exemption requests are, as they sound, requests that individuals be exempted from certain requirements that are meant to apply to all citizens equally; modification requests ask for changes in existing, majority, practices to accommodate certain other, minority, practices. Sikhs sometimes request exemption from laws that would, otherwise, require them to remove their turban as above; in other cases, they request uniform modifications, so that turbans are treated as one among several available head coverings for those carrying out a specific role. The same is true of uniform modification requests made by Muslim women who cover their faces or heads, and Jewish men who wear yarmulkes, where uniforms have traditionally required an uncovered head or face, or where they have required particular head coverings (as in the Sikh case, they may also be presented as requests for exemptions). Similarly, when observant Muslims request short breaks in their work day to pray at specific times of day, or when Jewish and Muslim students ask for changes in the provision of foods (to accommodate kosher and halal obligations) in school cafeterias, the request is for modification rather than exemption.