And if you don't want to open the link:
"Stink bugs "stink" because of two chemicals: trans-2-decenal and trans-2-octenal. Interestingly, those two chemicals are also found in cilantro (Coriander sativum), for which the mystery of why some people hate the taste of cilantro with a passion has been researched; turns out that only if you have a specific variant of olfactory receptors you can actually smell these two chemicals. People who have these receptors perceive both stink bugs and cilantro as soapy and pungent, while all others perceive it as neutral to pleasant. The part of the population who perceives stink bugs / cilantro as unpleasant is dependent on genetic ancestry and ranges from 3-21%"
If you zoom in, you can see that the "beak" is behind the leg in the foreground actually.
This got me interested and I looked up heteropteran mouthparts. The best description I could find was here. Apparently the segmented larger part of the beak here is the labium giving support to the stylus. The stylus is the blackish tube that runs from the head through the labium.
I woke up once with what felt like a large scab between my lips, stuck primarily to the bottom one. In my sleep and stupor, I thought it maybe dried blood, or food, or perhaps I ate a large booger in the night. The aroma was something else, though. As seconds passed and my brain began to make sense of what was actually happening, I realized that I had an entire stinkbug pressed flat between my lips.
This one time I woke up in the middle of night to scratch an itch under my big tee shirt on my back, I reached back to do a lazy pinch, then felt a crunch and instinctively crushed the damn thing. It was a yellow jacket quite close to my spine.