There are no hard and fast rules in preparing a resume.
Most resumes contain an objective.
Whether it is listed as a job, career or employment objective is irrelevant. All three basically indicate the same thing. When you include an objective, you are limiting your choices for different openings. For example, if your objective is to obtain a position in retail sales, sending your resume in reply to an employment advertisement for an accountant probably won't generate a positive response. However, if you are determined to obtain a retail sales position, the accounting job wouldn't interest you anyway.