I’m sure that the Chinese factories will be happy to churn iPhones out to whatever spec the Ministry of Defense wants and with absolutely no backdoors at all. None zip zilch.
You have a lot to learn about iPhone security.
Apple is in charge of the hardware design and software. Any hardware or software backdoors would stand out like a red flag to Apple's engineers since they designed everything about the iPhone, not the Chinese. The Ministry of Defense also has no say in the specs. Apple designed the processor, the boot loader IC, the Secure Element processor, and made the masks that make these processors through their own IC design company. The iPhone has its own automatic 256 bit AES encryption already built in, which is higher than our government's and Financial Industry's 128 bit standard AES encryption. The Ministry of Defense can only change the Apps being used, and add additional encryption on top of that already supplied. This is why the iPhone is the number one secure device on the market today. . . Apple, a US company, is responsible for the entire widget, and keeps it that way.
On the other hand, millions of Android phones have this feature built in to their Android OS. . .
Android Backdoor Is Secretly Sending User Data and Texts to China and No One Knows Why.