Here is his draft card. There could be a number of reasons please see a list of qualifications/disqualifications during that time period here is a link. When looking at his card he met the height and weight requirements but according to the book I read their were other qualifications standards for example Army would not take men with venereal disease, under 5foot, had loose of digits or toes, or had extreme dental abscesses. https://collections.nlm.nih.gov/ext/dw/0126710/PDF/0126710.pdf
I heard over the years that they could have also applied for a waiver based on that his household depended upon him for survival and aid especially if parents were elderly.
Dear Mr. Sowieralski,
Thank you for posting your request on History Hub!
Selective Service records for individuals who registered after World War I and were born before 1960 are in the custody of the National Archives at St. Louis (RL-SL). There are two types of records: cards and classification histories. The individual Draft Registration Card (SSS Form 1) may contain information such as: name, Selective Service registration number, age, date and place of birth, ethnicity, place of residence at time of registration and basic physical description. The Classification History (SSS Form 102) may contain: name; date of birth; classification and date of mailing notice; date of appeal to the board; date and results of armed forces physical examination; entry into active duty or civilian work in lieu of induction (may include date, branch of service entered and mode of entry, such as enlisted or ordered); date of separation from active duty or civilian work; and general remarks. Please complete a Form NA-13172 to request a search of these records and email it to RL-SL at firstname.lastname@example.org.
For men who registered for the draft prior to 1976, all other individual draftee files besides the cards and classification histories were destroyed by the Selective Service System in 1978, in accordance with approved records retention schedules. Physical examination and test results, medical letters, laboratory work, and other medical documentation that may have been included in these files no longer exist.
For more information, see Selective Service Records and Selective Service System Classification & Registration Records for 1940 – 1975.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RL-SL. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful.