4 objects total, emitting dim white lights, low altitude, even speed, flew at high speed but were completely silent

At about 2am I witnessed three unidentified flying objects (UFOs) in a formation heading in the direction of Lackland air-force base. About a minute later, another object with same features flew in the opposite direction. The three UFOs were low enough that I could see them making minor adjustments in their position between each other, indicating that they were independent from each other and not connected. They had a circular shape and emitted white lights, but lights were dim, each object had same light intensity, shape and size. Objects were not very noticeable if not flying directly above. They flew right above me and quickly blended in with the night sky as they moved away. They did not make any sudden or erratic maneuvers but rather flew in a linear direction. They were fast, but there was no sound associated with them. I remember clearly at that time there was no wind, or clouds. they looked too large and too quiet to be drones. They also flew in a restricted airspace, which would require permission to operate drones. This happened around 1:50-2 am, when there was very little traffic or people around, and at that time I don’t remember any cars or people in the area. The UFOs were too swift for me to capture them on my phone camera.
It’s not the only time I witnessed ufo but this is the most recent one. Also my friend in a different location in the US saw an object accelerate from approximately 20mph to thousands of mph within instance, but location and time I need to confirm with my friend.