408 THS in Edmonton is the closest airforce asset to Calgary.
If you join the AF, you will first be sent to Quebec for upwards of 11 months and then the AF will decide where to send you. Don't plan on ever being close to your hometown. I am from Toronto and haven't lived there (or close to there) since I joined.
If you get into RMC or ROTP you will owe a specified obligatory service - you can use the links provided to determine exactly how much. If you get accepted into the Pilot trade, you will owe more oblig service on top of what you already owe for school. Plan on at least 7-9 years after graduating Looniversity.
Recruiting is an issue that has been a bane in the proverbial side of the CF. Depending on your medical, security questionnaire and other pertinent factors, it may take upwards of one year. If you are planning on entering the CF after highschool, start the process the summer before heading back to school - just to get your name in the system.