Military service
Thailand: The Military Service Act B.E. 2497 (1954) states that all male citizens of Thailand are obliged to serve in the military upon reaching 21 years of age. High school students have the option of enrolling in the three-year Reserve Officers Training Corps (ROTC) during Matthayom 4–6 (i.e., Grade 10–12). ROTC students drill at a local military installation once per week during the school year for a total of 80 hours, with field training exercise at the end of the second year (over the duration 3 days) and third year (over the duration of 5 days). The ROTC program is operated nearly exclusively by the Royal Thai Army, with recent introductions by the Royal Thai Navy and Royal Thai Air Force, but both with more restrictions on entry (e.g. students of schools near a naval or air force base used for training only). Those who complete the three-year program are exempted from conscription and receive the rank of acting sergeant (E-6) upon graduation from high school. Students who do not complete the program or wish to enroll in the commissioned officer phase of the program can do so at their post-secondary institution. Those who do not complete the ROTC program will be required to report for conscription in early-April of the year in which they reach 21 years of age. 
Military service selection is done at a designated date and time at a local school or assembly hall. Each selection station has a quota for recruitment. The process begins with a call for volunteers. Those who volunteer will have the option to choose the branch of service and their date of induction. If the number of volunteers is fewer than the quota for the selection station, the remaining men will be asked to draw a card from an opaque box. The box contains red cards and black cards. Drawing a black card results in exemption from military service. Drawing a red card results in conscription in the branch of service and induction date on the card.
Those who volunteer for military service are free to choose from the three branches of the armed forces (Royal Thai Army, Royal Thai Navy, Royal Thai Air Force). Service obligation varies by educational qualification. Those with a high school diploma or the equivalent and those who have one year of military service education are required to serve for two years if they draw the red card, but if these same individuals volunteer, the service obligation is reduced by half, i.e., reduced to only one year. Those with an associate degree (or equivalent) or higher are required to serve for one year if drafted, but the requirement is reduced to only six months if they volunteered. University students can defer their service as long as they maintain the student status until reaching the age of 27 or obtaining a master's degree or the equivalent, whichever comes first. Undergraduate and graduate students who decide to volunteer are allowed by their institution to put their studies on suspension until the end of term of service. All conscripts, regardless of educational qualification, undergo the same training and receive the same grade and rank upon completion of basic training: private, seaman, or airman (E-1).
In recent years the government has issued new guidelines for better treatment of transgender recruits.

Tunisia: In Tunisia compulsory military service applies to all citizens from 20 to 35. Those who are engaged in higher education or vocational training programs prior to their military drafting are allowed to delay service until they have completed the programs. The duration of the military service is 1 year. And Conscripts Benefit a monthly allowance of 200 dinars for holders of a higher school diploma or have completed at least two years of graduate successfully and holders of a higher technician certificate of vocational training and 100 dinars for other recruits.

Turkey: In Turkey, compulsory military service applies to all male citizens from twenty to forty-one years of age (with some exceptions). Those who are engaged in higher education or vocational training programs prior to their military drafting are allowed to delay service until they have completed the programs, or reach a certain age, depending on the program (e.g. 29 years of age for undergraduate degrees). The duration of the basic military service varies. As of July 2013, the reduced durations are as follows: twelve months for privates (previously fifteen months), twelve months for reserve officers (previously sixteen months) and six months for short-term privates, which denotes those who have earned a university degree and have not been enlisted as reserve officers (previously eight months).
Turkish citizens who have lived or worked abroad for at least three years can be exempt from military service in exchange for a certain fee in foreign currencies. In the past, when the General Staff assessed that the military reserve exceeded the required amount, paid military service of one-month's basic training was established by law as a stopgap measure, but had only been practiced ten times during the Republican era before being made permanent, the last one being in 1999. This was done in order to generate funds to recover from the aftermath of the 1999 İzmit earthquake, which took place in the highly industrialized Marmara Region of the country, and had a considerable negative impact on the Turkish economy due to the severe damage it caused to a significant number of residential and industrial structures. Additionally, there were paid military service without requiring any training in 2011 and 2014. The measure has been made permanent with a law issued in 2019.
Although women in principle are not obliged to serve in the military, they are allowed to become military officers.
Conscientious objection of military service is illegal in Turkey and punishable with imprisonment by law. Many conscientious objectors flee abroad mainly to neighbouring countries or the European Union (as asylum seekers or guest workers).

Ukraine: The options are either reserve officer training for two years (offered in universities as a part of a program which means not having to join the army), or one-year regular service. In Ukraine, a person could not be conscripted after he turned 25 years of age. The Ukrainian army had similar problems with dedovshchina as the Russian army did until very recently, but in Ukraine the problem is getting less severe compared to Russia, due to cuts in the conscript terms (from 24 to 18 months in the early 2000s and then to 12 months in 2004) and cuts in total conscription numbers (due to the switching of the army into a full-time professional army) since the last conscripts are being drafted at the end of 2013. However, due to the war with Russia, conscription was reinstated and remains in power to this day.

United Arab Emirates: The United Arab Emirates started its national service requirement in September 2014. This is the first time the UAE has required mandatory national service. It is compulsory for all male citizens over 18 and under 30 years of age to report for military service. Foreign male residents are not required to serve in the military service. It is optional for females to register for military service, and which they serve for 9 months. Males who hold a high school diploma must complete 11-months of military service, whilst males who have not completed high school must complete three years. All males must register for compulsory military service after graduating high school.

Vietnam: Vietnam's military service policy change from year to year, but in general there is the commonality that every male citizen aged 17 years or older who meets the health criteria must serve two years for regular military or four years for militia of self-defense. Female citizens are not required to participate in military service, but if volunteered and fully qualified they can still participate. There are special exceptions: such as the citizen brother or brother of fallen heroes, a child of second class war invalids; a sick child of 81% or more; a child of Agent Orange who has a working capacity decrease of 81% or more, a non-military employee, a people's policeman and cadres, civil servants, and youth volunteers to be sent to work and work in areas with particularly difficult socio-economic conditions as prescribed by law for 24 months or more.

See also: List of enlistment age by country
Military recruit training

References: 

Works cited: Hunter, Helen-Louise (2008). "The Society and Its Environment". In Worden, Robert L. (ed.). North Korea: A Country Study (Fifth ed.). Washington: Government Printing Office. pp. 59–134. ISBN 978-0-16-088278-4. LCCN 2008028547.
Minnich, James M. (2008). "National Security". In Worden, Robert L. (ed.). North Korea: A Country Study (Fifth ed.). Washington: Government Printing Office. pp. 237–282. ISBN 978-0-16-088278-4. LCCN 2008028547.

External links: 
Dated but useful info