Hashtags (#) 
Hashtags are used to make topics more searchable or easy to find. The top hashtags are shown On Twitter as “trending topics.” Hashtags are particularly useful during events or when breaking news is happening. The U.S. Army uses hashtags to designate its post about relevant events or issues that may be trending. Click on the hashtags below for examples of them:

#USArmy 
#ArmyStrong
#ArmyRecruiter

Beyond simply organizing your tweets, Twitter hashtags can help you  craft your voice while joining in a larger discussion. You can use  multiple hashtags in one tweet, but don’t go overboard. One to three is  generally an acceptable range.

Here are some sample tweets that use hashtags (in bold) to add context, humor and voice:

         Let the weekend begin! #TGIF

    Wearing socks with Crocs is so stylish #kidding

    Just dropped my second ice cream cone. #fail

    I hate when people smoke e-cigarettes indoors. #annoying #rude  #whygodwhy

     The movie #Gravity is beautiful, but so terrifying!  #nevergoingtospace

     I’m loving 'The Sound of Things Falling' by Juan Gabriel Vasquez  #FridayReads
Many major brands now have Twitter accounts, and some choose to create hashtags to promote specific events or campaigns. If you want to use  Twitter as part of  your business strategy, here are a few tips to keep  in mind:
As it pertains to USAREC, many recruiters use the hashtag #MakeMission.

For example:
If you want to create a special hashtag for an event or campaign, select one that hasn't been used before and remind everyone to use it in related
tweets. Be sure to include the hashtag in any promotional  materials. Make it informative but short.