conscription does not exist
Gambia has no conscription and has never had since it achieved independence in 1965.    
Enlistment in the armed forces is voluntary. The minimum recruitment age is 18 for both male and female recruits. Initially recruits enlist for a specified minimum period, in which they undergo a training of 4 to 6 months, thereafter they may wish to re-engage in the armed forces for another specified period. 
2 Conscientious objection
There is no known legal provision for conscientious objection.
3 Draft evasion and desertion
No information about this is available.
Under British colonial rule, Gambia had conscription and according to the 1942 Ordinance 11, art. 10, CO status could be obtained. 
From 1965 to 1994 the Gambia was a rather stable multi-party democracy, but its president was not very popular. The armed forces were under command of a Nigerian colonel. This changed abruptly on 22 July 1994 when there was a military coup by 29-year-old Yahja Jammeh, which was executed without any substantial violence. From then on Gambia has been controlled by a military government, the Armed Forces Provisional Ruling Council (AFPRC). On 15 August 1996 a 70 percent majority vote for the adoption of a new constitution seems to be a success for the military government. In September 1996 Jammeh was elected as president.  
6 Annual statistics
The armed forces comprise only the 800 strong Gambian National Army - less than 0.1 percent of the population. 
 Prasad, D., T. Smythe 1968. Conscription: a world survey, compulsory military service and resistance to it. War Resisters' International, London.  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.  US State Department 1996. Country reports on Human Rights Practices 1996. Washington DC.  De Tageszeitung (German newspaper), 16 August 1996.  Institute for Strategic Studies 1997. Military Balance 1997/98. ISS, London, UK.  Department of State for Defence, Republic of the Gambia 1998. Letter to Friends World Committee for Consultation, Banjul, 7 January 1998.