I have a large worksheet with about 700 employees; each employee has at least
1 row for every date of the month, and several columns. For each employee, I
would like to search Column C for 2 specific values. If those values are
found on any row for that employee, then the value in Column C should be
copied to the corresponding row in Column D for that employee (even if that
row does not contain the value searched for). Example:

The value being searched for (RSV) is found in at least one of the rows for
employee # 123. So, column C for ALL rows (even without RSV) are copied to
the corresponding column D for that employee. The value RSV is not found in
column C at all for employee 456, so column D for that employee is left alone.

Original:
A B C D
123 1/1 RSV aaaa
123 1/2 OFF bbbb
123 1/3 OFF cccc
456 1/1 OFF OFF
456 1/2 aaaa aaaa
456 1/3 bbbb bbbb

Result:
A B C D
123 1/1 RSV RSV
123 1/2 OFF OFF
123 1/3 OFF OFF
456 1/1 OFF OFF
456 1/2 aaaa aaaa
456 1/3 bbbb bbbb