There are government, police, and military positions available to green card holders; however, some jobs are only available to United States citizens.
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Some police departments do require U.S. citizenship, other ones do not. Also, some branches of Government and military positions are open to LPRs, yet certain such positions like the FBI, BAFT, CIA and others do require the U.S. citizenship as an absolute pre requisite for employment eligibility with such federal agencies. You may inquire with each particular federal or state employer further.
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It totally depends on the governmental organization as to whether a green card is sufficient or whether you need to be a US citizen
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