Final answer:
Military regulations often allow for the grooming and shaping of beards permitted by profiles, aligning with operational requirements and safety standards, exemplified by historical instances like Hitler's moustache trimming during WWI.
Step-by-step explanation:
The answer to whether soldiers with profiles allowing beards are authorized to shape the hair growth can vary depending on specific military regulations and grooming standards of the country or branch of service they are serving in. However, it is quite common for military guidelines to provide provisions for the grooming of facial hair for those who are permitted to wear beards for various reasons, including religious beliefs, medical profiles, or unique unit standards. Specifying how the beard may be maintained, including shaping or trimming, is typically included in these regulations.
For instance, during World War I, Hitler adjusted his moustache by trimming it to fit within the confines of a gas mask. This historical fact underscores the military's practical approach to grooming standards, adapting them in response to operational requirements. Ultimately, the permission to shape a beard would align not just with personal preference but in concordance with ensuring that soldiers can effectively perform their duties while meeting safety standards.