Is the following sentence acceptable?
To be a police officer can be a tough and unpredicatble job, but it is also the most rewarding position I will ever have.
If I delete "I will ever have", is it still acceptable?
That's a better thread title than your usual 'sentences', contiluo. It has relevance to the question.
To add to 5jj's answer, deleting I will ever have removes the personal aspect. It is saying it's the most rewarding position anybody will ever have.