Since 19D is a balanced MOS and 68V is a shortage MOS, if you meet all the qualifications (below), you should be good to go once your reenlistment window opens.
Respiratory specialists must possess the following qualifications:
(1) A physical demands rating--N/A.
(2) A physical profile of 222221.
(3) Normal color vision.
(4) Qualifying scores.
(a) A minimum score of 105 in aptitude area ST in Armed Services Vocational Aptitude Battery (ASVAB) tests administered prior to 2 January 2002.
(b) A minimum score of 102 in aptitude area ST on ASVAB tests administered on and after 2 January 2002.
(5) Algebra and chemistry, high school (1 year) or college (1 semester) with a passing grade of "C" or higher.(6) No history of a felony conviction.
(7) No history of conviction of crimes involving:
(a) An out of hospital patient or a patient or resident of a medical care facility.
(b) Financial exploitation of a person entrusted to a care of the applicant.
(c) Any weapons/ammunition/explosives/arson charges.
(d) Any drug activity involving illegal possession, buying, selling or distribution (dealing) of controlled substances or synthetics.
(e) Violence against persons or property.
(f) Sexual misconduct.
(8) No record of conviction by special or general courts-martial or civilian courts of offenses listed in AR 27-10 (Military Justice), chapter 24 or otherwise required to register as a sexual offender under AR 27-10, chapter 24.
(9) Formal training (completion of MOS 68V course conducted under the auspices of the AMEDD Center and School) mandatory.