Whisper is a mobile app which allows its users to post anonymous messages (called "Whispers") out into the ether and receive replies from other users who might be interested in what they have to say. The messages are text superimposed over a (presumably) related photo to illustrate the point.
A recent update allowed Whispers to be categorized into a few firm subcategories: Confessions, LGBTQ, NSFW, QA, Faith and Military. Military members and those with an interest in the military can "anonymously" (quotes included because the app still tracks users with their phone's GPS) post their thoughts, feelings, and interactions with military members. Some of the confessions can be funny, but others give insight into real struggles veterans face when they feel alone and have no one to turn to and the struggles their families face trying to help their loved ones reintegrate after war.