Mrs M, when was the last tine you were on the strip after midnight. I used to frequent GTS which often stayed open until 4 am as did other bars / clubs and probably will be there again next year. I usually have finished my meal several hours before that.
The only time I have had any trouble is if I had to meet my girlfriend as she did not have an ID card with her. They insisted I came to collect her at one of the checkpoints. I was never asked for a bribe to let her pass and neither was she. Any other Gambian friends never had any trouble and none of them were Bumsters.
If you know for a fact that the soldiers take bribes it is your duty to report it to the appropriate authorities.