Non-immigrant Visas
Temporary Workers: 
Employers who wish to hire foreign workers for  temporary period for services or to receive training may file an I-129 petition. In most cases, workers who enter the United States under this petition must depart the U.S. when their maximum period of stay has been reached. Form I-129 may also be used to petition for an extension of stay or change of status for certain non-immigrants.
 
There are many categories of workers who are temporary visitors symbolized by letters which generally correspond to the visas issued by the State Department. 
 
			H-1B: Specialty Occupation
 
			H-2B: Temporary Non-agricultural Workers
 
			L-1: Intracompany Transferee
 
			O-1: Extraordinary Ability
 
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