I wouldn't trust NSA with a "hello world" program. The way they might phrase it could trigger hidden feature in linker which in turn could trigger hidden instructions in CPU making the 3 lines program a backdoor into your system.
You better avoid the Linux kernel then as the NSA have contributed a lot more than 3 lines.
I hate to break it to you, but NSA's hello world program is line by line identical with the others you have seen. How did they infiltrate us so badly! It's a scary day for anyone running mission critical hello world programs in production.
brings the concerns that seem to have been forgotten about the strange CPU behavior with their preffered version with elliptical curve