No, a score of 70 on the ASVAB is generally considered a good and competitive score. This score refers to your Armed Forces Qualification Test (AFQT) percentile, meaning you scored higher than 70% of the nationally representative sample used for comparison.
An AFQT score of 70 is well above the minimum enlistment requirements for all branches of the U.S. military. This high score makes you eligible for enlistment and opens the door to a wide range of job opportunities. Each military job, known as a Military Occupational Specialty (MOS), has its own minimum score requirements on specific combinations of ASVAB subtests, called “line scores.” With an AFQT of 70, you are likely to qualify for most, if not all, jobs, including more technical and advanced fields that require higher aptitude in areas like electronics, mechanical comprehension, or general science.
In essence, a score of 70 is an asset. It demonstrates strong foundational knowledge in math and verbal skills and positions you favorably when negotiating your enlistment contract, including potential incentives like job guarantees or enlistment bonuses for critical roles.
For context on where this score is evaluated, you can learn about the authority of MEPS in the enlistment process.
For the most current and official information on how ASVAB scores translate into job eligibility, you should consult the official ASVAB Career Exploration Program site or speak with a military recruiter.