Take a look at the link. I can't attest to its accuracy since it is wikipedia, but I'm sure it gets close enough.
I will agree with you on tanks, even though those are crew devices, and one person can't really efficiently operate one. I'll even give you grenades, mines, grenade launchers, even fully automatic submachine guns.
But knives? The military trains with those. You might have a point, they kill people, just ask serial killers and muggers. We should probably ban those too.
Well, the military trains with multiple handguns as well, fortunately they don't use the Desert Eagle .50 caliber and they just use 9mm. I'm sure gun enthusiasts won't mind giving up those and keeping the hole punching power of that .50 cal.
Rifles, we have lots of those as well. Fortunately we only have to ban a few versions of the AR-15 platform that they sell to the military, since I'd rather have the much more powerful 7.63 upper on mine. Who needs 5.56 or .223 right? And I guess I don't have to hunt with the rifles the snipers use for training either, I'm sure there are others out there to find anyway. At least they don't seem to be using bolt action or lever action rifles anymore, so those are still good.
Just to be safe we should probably ban fertilizer from being sold since people turn that into bombs all the time.
The point of my statement, which I'm sure will fly past your head, is that the military trains with weapons, also known as tools. I can use an axe to chop down a tree, cut firewood, or remove the empty space above your shoulders. One of those is bad, it doesn't mean that the tool is at fault. Only in America is there such outrage with firearms. Someone who wants to kill has many tools available. Limiting them will not stop the killing. Handguns that are semi automatic like the aforementioned Desert Eagle can hold many rounds, and one bullet from that will go through a lot of people before it stops. This ban guns nonsense does nothing to solve the problem. The most logical reason to me that the AR-15 is so popular for active shooters is because it is the most popular rifle in America, it has nothing to do with how deadly it is.
Now please stop using the military trains with XYZ to tell people what they should and should not be allowed to have in their home.
For the record, I am for sensible gun legislation, at the state level, not the federal, and I own absolutely no firearms (I'm not a gun nut or advocate).
Link: List of weapons used by the US