Guinea has conscription.   
Military service lasts for 24 months.  
postponement and exemption
No information about this is available.
About how recruitment actually takes place, no information is available.
2 Conscientious objection
There is no legal provision for conscientious objection. 
3 Draft evasion and desertion
Refusal to perform military service is punishable by imprisonment. 
No information is available about the actual treatment of draft evaders and deserters.
6 Annual statistics
The armed forces comprise 9,700 troops - which is just over 0.1 percent of the population. It is estimated that 7,500 are serving conscripts. 
Furthermore there is a 7,000 strong people's militia, a 1,600 strong Republican Guard and a 1,000 strong Gendarmerie. 
Every year approximately 65,000 men reach conscription age. 
 Eide, A., C. Mubanga-Chipoya 1985. Conscientious objection to military service, report prepared in pursuance of resolutions 14 (XXXIV) and 1982/30 of the Sub-Commission of Prevention of Discrimination and Protection of Minorities. United Nations, New York.  Guinness World Fact Book. Guinness Publishing, London, 1994.  UN Commission on Human Rights 1997. The question of conscientious objection to military service, report of the Secretary-General prepared pursuant to Commission resolution 1995/83. United Nations, Geneva.  Institute for Strategic Studies 1997. Military Balance 1997/98. ISS, London, UK.