How does a Tour of Duty from non government computer ?

Carrera can be accessed from any computer with a CAC reader.

All it does is show data from TOD.

Short answer - Contrary to popular belief, you can (well, you can't directly access it. You have to remotely access a server inside the network).

******** EDITED AND UPDATED ********
Well, learn something new each day. While looking at a Citrix reference, I came across this amplification about something I said regarding the 2022 NDAA.

The Army rolled out an application called Carrera. You get Carrera from the Army Software Factory and can install it on your mobile device. Head to https://carrera.swf.army.mil/ to start the process.

You can read the Army Times article about it here - https://www.armytimes.com/news/your-army/2022/02/16/guard-reserve-soldiers-can-now-browse-active-duty-jobs-on-their-phones/

If you want to go the Citrix route for access to other systems or to use your desktop (without installing an Android emulator), read on to the original post below.

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SFC(P) (Join to see), you can't access Tour of Duty (TOD) from outside a .mil network normally ... yet. HOWEVER, if you are USAR (sorry ARNG) and jump through some hoops, you can - well, you won't technically be accessing it outside of a .mil network .. you'll be remotely accessing the .mil network and logging in from there (see below).

As it stands right now, access to TOD is restricted to the military domain. You used to be able to from your home, but that changed a number of years ago.

However, the 2022 NDAA contains a provision that requires that it be opened up to access from personal devices (in other words, outside the .mil domain). The law was signed by the President in late December of 2021 and gave the military one year to make it happen - one year will be up in a little less than two months.

Right now the Army is evaluating this as part of the Bring Your Own Device (BYOD) initiative to allow personal devices to access resources on the .mil domain.

So, you can't right now, but you should be able to (again) in the near future.

Now ... how about that "remote access to a .mil network" thing.

If you haven't heard of it before, the military uses CITRIX to access .mil networks from the outside. You log into a CITRIX server and that acts as a go-between from the computer on the outside of the network and the resources on the inside of the military's network.

You'll need to have an Army Reserve Network (ARNet) account, install Citrix Workspace on your computer, and of course, have a CAC reader with the compatible software.

Since others have written many help articles, I'll just point you towards them.
https://helmers.io/accessing-arnet-from-any-computer/

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SSG (Join to see) MSG (Join to see)

If you are asking how can you access TOD from a non-DOD computer ... the answer is you cannot. They were attempting at one point to make this accessible to all, but it has not been rolled out that way yet. You will have to wait until next drill and jump on the network from your unit.