Can you get into the Military if you have asthma?

If the ashtma is controlled with/without medication.
I heard from a Marine friend of mine that there are Marines who have Asthma.

The Medical Corps will determine if asthma is not a hindrance to the rigorous life of a soldier.

If you had symptoms past your 13th birthday or have to take daily medication you are a no-go..

Asthma, (493), including reactive airway disease, exercise induced bronchospasm or asthmatic bronchitis, reliably diagnosedat any age. Reliable diagnostic criteria should consist of any of the following elements:

(1) Substantiated history of cough, wheeze, and/or dyspnea that persists or recurs over a prolonged period of time, generally more than 6 months.

(2) If the diagnosis of asthma is in doubt, a test for reversible airflow obstruction (greater than a 15 percent increase in forced expiratory volume in 1 second (FEVI) following administration of an inhaled bronchodilator) or airway hyperactivity (exaggerated decrease in airflow induced by standard bronchoprovocation challenge such as methacholine inhalation or a demonstration of exercise-induced bronchospasm) must be performed.

Guide Note:Up until just a few years ago, receiving a medical waiver for asthma was virtually impossible. That's still the case, if the applicant *currently* has asthma, or if they have a history of asthma that was reliably diagnosed, after their 13th birthday. Under new MEPS policy, dated 4 June 2004, asthma is a disqualifier, only if it was present after the 13th birthday. Applicants with a history of asthma will be required to sign an official statement, certifying that there have been no attacks (including exercise induced asthma) since the age of 13. For details, see New Asthma

Asthma after your 13th birthday is disqualifying for entry into the armed forces. This includes reactive airway disease, exercise-induced bronchospasms and asthmatic bronchitis.
The source below is the medical standard.

No i don't think so. I tried to go to the air force and i got declined because i also have a history of asthma although it no longer has a huge effect on me.

If you've had any attacks since the age of 12 then you're PQ'd (permanently disqualified) from all military branches. Talk to a recruiter if you want to know more.

Not if you have had any attacks after the age of 12.