Note well: I'm using the terms "chaser" and "target" in this answer. These are technical terms with a long heritage (relatively to the space era). The chaser vehicle acts to change its orbit. The target vehicle keeps its orbit.
Suppose the chaser and target are orbiting an object with no atmosphere, and that the chaser is in the same orbital plane as is the target, and that the chaser has the same semi-major axis as the target. Tweak the chaser's other orbital parameters just right and the chaser will follow a more or less oval shape about the target. Think NASCAR, where drivers only turn left. (I prefer non-oval races. Then again, F1 is boring.)
Tweak it just right and, ignoring atmospheric drag, the chaser will "orbit" the target in an oval centered on but always missing the target. Atmospheric drag is not something to ignore. The vehicles that bring crew and resupplies to the ISS are bullets. In comparison, the ISS is a huge butterfly. Fortunately, the ISS is a cooperative target. (Other targets: Not so much.)
Given that the Internet is chock full of mentions about racetracks but never mentions the details, I gather that those details are not to be released. But the summary description as an oval where the vehicle only turns in one direction thanks to gravitation: that's just Kepler's laws.
Note well: If the DoD had it's druthers, $F=ma$ and $F=GMm/r^2$ would be classified as TS NOFORN, as would be Kepler's laws. That's one of those details.