On Area 51, there were at least two proposals. Both were deleted.
Proposals with insufficient activity are subject to removal. Occasionally, proposals may also be removed for reasons of moderation: spam, off topic, abuse, etc.
If I may ask, were these removals due to "insufficient activity" or due to military-related matters being considered off-topic?
The reason I ask this question is that I see no point in gathering a few people and attempting to start a new SE site that will never take off due to its being considered off-topic.