Henry 'Whirlwind' Carter is an agent with the ISS.
That is the Interplanetary Secret Service which going by its name would having it being likely the main intelligence gathering and special covert operations organization in the near future. How big that department is remains a secret to use because of the limited amount of information.
We are told in the introduction to his first recorded adventure that "'Whirlwind' lives on the highly civilized planet of Venus ... Through his powerful scopes and super television sets, he keeps in touch with the other planets ... He has acquired a vast knowledge ..." Knowledge of what we are not told so I would assume it is of a range of topics. We also soon learn that he is in charge of the Venus office though whether that means he is the Venus office, we do not know.
Carter is a physically impressive man in his mid-30s with fairly short blond hair split in the middle. He is seen in both of the adventures we have of him wearing a blue form-fitting full body suit with a yellow collar and a yellow belt.
In that first adventure, he encounters a blonde-haired woman named Brenda Hale who, according to her calling card is an agent with the "Space Army, Women's Div." Her response of "So you are the great 'Whirlwind' Carter?" shows that his fame has definitely spread enough so someone not from Venus has heard of his exploits.
Carter has a fair amount of interesting futuristic equipment at his headquarters. This includes a strange telescope with dozens of looking glass tubes sticking out of it pointing in all directions, even down to the ground (?) and this device has a 'negative spot-ray' which allows him to spot an invisible planet coming into the solar system. He also has a multi-knobbed and handled 'thought-detector' which he uses to monitor that invisible planet to catch the one person in all its peoples that is thinking what the overall plan of action is going to be. [Note, those nasties have an 'anti-solr system ray machine' which sounds really bad.]