[knz]

https://en.m.wikipedia.org/wiki/Boeing_X-37

We know that they have similar technology in production today (using more conventional technology but with the same result).

It's also likely no coincidence that "Space Force" is a thing now.

[m4rtink]

X-37 is pretty small and rather hard to miss as it launches on a giant pillar of fire every time. Not likely similar to a craft described by the OP.