crew cut 
noun
A very short haircut for men and boys.A few strands of black hair hung in the man's eyes; his haircut looked like a crew cut not taken care of....
- His hair cut short in a crew cut and dressed with a bow tie and suspenders, he looked more like an accountant or professor.
- One was Asian, with a crew cut hairstyle and a goatee beard.
Origin
1940s: apparently first adopted as a style by boat crews of Harvard and Yale universities.