I've heard of the military diet before but hadn't looked at it until now and....it makes zero sense. Canned tuna and vanilla ice cream are just....not good for you in any capacity, haha. If you wanna go for something a little on the non-traditional side, I would recommend something like JUDDD/Every Other Day Diet/Intermittent Fasting OR Potato Hack. My favorite of these is the Potato Hack, because while you are doing it you are forced into eating healthy. The other diets are scientifically sound (you should be able to find study and methods online pretty easily) but they give you total freedom of what you eat...they only manipulate how much or how often you eat.
Basically, there are a lot of "harsh" diets out there can help you drop some pounds, and it might be best to try a few and see what works for you. Most of these are not "one size fits all," so they might work for a lot of people but now work for you in particular.
A lot of people will recommend you change your eating and lifestyle habits instead of "dieting" which is good advice! But sometimes you need a little kick to get things moving or to lose the last few pounds.
I also HIGHLY recommend doing some purposeful exercise. Walking and biking is great, but you should also set aside some time to specifically workout with intensity. Even if it's only 20 minutes a day, you should challenge your body to stimulate change.
If you need help finding any info on any of these things let me know and I can point you in the right direction