Talk:Volt/@comment-2.51.123.179-20150831125633/@comment-26355183-20150831130903

Any mission that drops its rewards after set criteria (wave or time, which means Survival, Interception, or Defence) does so in rotation.

Items are dropped in this pattern: AABC

The first two drops pull from the same pool, the third pulls from another, and the fourth pulls from another, then it goes AABC again.

5   10   15  20   25  30  35  40   45  50  55   60

A    A    B    C    A    A    B    C    A    A    B    C