All citizens subject to compulsory military draft are required to undergo a medical examination, the purpose of which is to identify possible contraindications to its performance. There are only five standard categories of validity, denoted by the first capital letters of the Russian alphabet (respectively: A, B, C, D and D). We will talk about them in more detail, paying particular attention to the differences between the concepts of "limited fit" and "fit with minor restrictions."
Category “A” includes conscripts who do not have any contraindications to military service. These are absolutely healthy young people who are subject to compulsory conscription in all types of troops, including the Airborne Forces,
border troops and special forces. Category “B” (“eligible with minor restrictions”) implies the presence of temporary contraindications to service. These include temporary disorders due to acute illnesses, recent surgery, a period of remission, etc. When the body is fully restored, young people are subject to re-conscription to all troops, with the exception of the above.
Category "B" ("limited eligibility") differs from category "B" in the presence of more serious diseases that do not imply an early recovery of the body. As a rule, persons assigned to it are credited to the reserve and are not subjected to draft in peacetime. The “limited fit” category includes diseases such as tuberculosis, epilepsy, syphilis, central nervous system disorders, spinal cord or brain injuries, glaucoma, etc. The presence of the same ailments, but in a more serious or even “neglected” stage, becomes the reason for assigning the category “D” (“unfit for military service”).
We will not disregard the category "G", which provides a temporary reprieve from military service (for a period of six months to a year). As a rule, this category is assigned in the presence of any injuries or diseases: bone fracture, obesity, dystrophy, etc. After the delay period, the military enlistment office will send the summons again.

Unfortunately, few recruits are aware of the above nuances, as a result of which, even after assigning a particular category, they simply do not understand its meaning. Therefore, knowing about your poor health, you need to prepare in advance for the passage of the medical commission. What is needed for this? First of all, to thoroughly study the list of diseases that preclude military service. Then you should compare them with the diagnoses in your own medical record. Next, it is worth deciding on which ailment should be emphasized when communicating with members of the medical board. It will also be nice about a year before the call to start visiting all kinds of doctors, accompanied by the inclusion of relevant information on the card. And, most importantly, you need to go to the medical board, armed with all the necessary documents, indicating the presence of contraindications to military service.
In this article we gave a brief description of the main categories of fitness for military service, and also delimited such subtle concepts as “limited fit” and “fit with minor restrictions.” This useful information will allow recruits to prepare in advance for the passage of the medical commission.