If I need to move to the day shift , does my employer have to cooperate if I provide documentation?

Question Details: I work for a shipyard that has put me on night shift. I have been on this shift for over 1 month (I have worked for this company for 110 days so far) and my wife has recently been diagnosed with bipolar disorder and anxiety (she works days and has filed and been approved for FMLA to get to her appointments).

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