What visual characteristic does the MK-127 display upon ignition?

The MK-127 is designed to provide an effective visual distress signal, and upon ignition, it produces a white star flare. This characteristic is crucial for its function because the bright white light is highly visible against the night sky, making it an effective tool for attracting attention and signaling for help. The ability to see this flare from a distance can be vital in search and rescue operations, increasing the chances of someone noticing the signal and responding.

In comparison, the other options represent different types of flares or signals that either do not match the MK-127's specifications or serve different purposes. For example, a red star flare is known for its different usage scenarios and is not a characteristic of the MK-127. Similarly, blue smoke signals and green parachute flares serve unique roles that do not align with the white illumination produced by the MK-127 upon ignition. The focus on the white star flare highlights its significance in emergency signaling, particularly in maritime contexts.