Can I as a Canadian in love with a Tunisian Military officer be married to him here in Tunisia?

It doesn't matter if he in the military, what matters is following the rules for Canadians marrying abroad. This is from the Service Canada website:

Getting Married Overseas

If you are getting married overseas, most countries will require a statement in-lieu of certification of non-impediment to marriage abroad. You can apply for one by mail to the Department of Foreign Affairs and International Trade Authentication and Service of Documents section before your departure. If you are already abroad, you may obtain a "Statement in lieu of Certificate of Non-impediment" from the nearest Canadian government office abroad.