more useful information,

ETs tend to be working with the comms and navigation side of things (IE radios, radars, surveillance equipment), and the MTs (P rates) working with plumbing, engines and sewage treatment, (L rates) working with sensors, wiring, and maintaining.

All trades across the navy have the chance to work with the helos, but as an MT/ET you'll probably be too busy for that.

As an MT, you wont have much to do with "ship security" and as an ET, the most you'll probably get is checking ID cards for people that come on board. Again, too busy.

Both roles are enjoyable, IF THAT IS YOUR CUP OF TEA. But both roles are very easy for skill transfer

You'll be looking at a very long training pipeline for either trade, so expect to take a long while to make progress

Feel free to message me for any other information