@ couerdelion: Tanks are actually allowed each of these three promotions by default. So no problems there.
How did I do this? Well, for a start I didn't bother with early warfare, or anything like that. I just teched, teched teched, until I could build tanks. I ofc had a great general ready to slap onto the very first tank I build. Then I declared war on one foe and just started hitting him, with that single tank and some infantry for support (healing mostly). My goal wasn't to kill him, just to get experience on my tank.
Remember I played on settler difficulty. So I had a huge techlead. I was facing mostly melee and archery units. All easy battles.
The next step was upgrading my tank to a modern armor. By that time he had something like 50 exp or so, enough for drill and combat IV.
Once he was a modern armor I simply declared war on every civilization at once. I spent the next 30 or so turns defending my territory which was being invaded from all sides. The pillaged half of my land, because, of course, I only wanted to use my one tank in defence. After they stopped comming for me, I went for them.
He killed about 4 enemy civilizations on his own. He would have gotten them all if I had had more turns
There's one important trick to getting lots of experience. Easy battles yield less experience than tough ones. So most of the time I kept my tank about about 20 strength, just to make battles tougher. You want those battles with a 99.x% chance of winning, because they often yield 2 or even more exp. Even lower odds battles would give even more exp, but then your unit could die. You don't want that.
How did I do this? Well, for a start I didn't bother with early warfare, or anything like that. I just teched, teched teched, until I could build tanks. I ofc had a great general ready to slap onto the very first tank I build. Then I declared war on one foe and just started hitting him, with that single tank and some infantry for support (healing mostly). My goal wasn't to kill him, just to get experience on my tank.
Remember I played on settler difficulty. So I had a huge techlead. I was facing mostly melee and archery units. All easy battles.
The next step was upgrading my tank to a modern armor. By that time he had something like 50 exp or so, enough for drill and combat IV.
Once he was a modern armor I simply declared war on every civilization at once. I spent the next 30 or so turns defending my territory which was being invaded from all sides. The pillaged half of my land, because, of course, I only wanted to use my one tank in defence. After they stopped comming for me, I went for them.
He killed about 4 enemy civilizations on his own. He would have gotten them all if I had had more turns

There's one important trick to getting lots of experience. Easy battles yield less experience than tough ones. So most of the time I kept my tank about about 20 strength, just to make battles tougher. You want those battles with a 99.x% chance of winning, because they often yield 2 or even more exp. Even lower odds battles would give even more exp, but then your unit could die. You don't want that.
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