Inclusion Criteria:  Age of 18 to 50 years Access to BWH trial site and willingness to be followed for the planned duration of the study Ability and willingness to provide informed consent Assessment of understanding: volunteer demonstrates understanding of this study; completes a questionnaire prior to first vaccination with verbal demonstration of understanding of all questionnaire items answered incorrectly Agrees not to enroll in another study of an investigational research agent Good general health as shown by medical history, physical exam, and screening laboratory tests Willingness to receive HIV test results Willingness to discuss HIV infection risks and amenable to HIV risk reduction counseling.  Assessed by the clinic staff as being at "low risk" for HIV infection and committed to maintaining behavior consistent with low risk of HIV exposure through the last required protocol clinic visit. HVTN low risk guidelines will be used.  Laboratory Inclusion Values Hemogram/CBC  Hemoglobin ≥ 11.0 g/dL for volunteers who were born female, ≥ 12.0 g/dL for volunteers who were born male White blood cell count = 3,000 to 12,000 cells/mm3 Total lymphocyte count > 800 cells/mm3 Remaining differential either within institutional normal range or with site physician approval Platelets = 125,000 to 450,000/mm3 Chemistry  Chemistry panel: ALT, AST, and alkaline phosphatase < 1.25 times the institutional upper limit of normal; creatinine < 1.1 times the institutional upper limit of normal.  Virology  Negative HIV-1 and -2 blood test: US volunteers must have a negative FDA-approved enzyme immunoassay (EIA). Negative Hepatitis B surface antigen (HBsAg)  Negative anti-Hepatitis C virus antibodies (anti-HCV), or negative HCV polymerase chain reaction (PCR) if the anti-HCV is positive  Negative urine glucose, and Negative or trace urine protein, and Negative, trace, or 1+ urine hemoglobin (if 1+ hemoglobin is present on dipstick, a microscopic urinalysis with red blood cells levels within institutional normal range).  Reproductive Status  Volunteers who were born female: negative serum or urine beta human chorionic gonadotropin (β-HCG) pregnancy test performed prior to vaccination on the day of initial vaccination. Persons who are NOT of reproductive potential due to having undergone total hysterectomy or bilateral oophorectomy (verified by medical records), are not required to undergo pregnancy testing.  Reproductive status: A volunteer who was born female must:  Agree to consistently use effective contraception (see Appendix A and Appendix B) for sexual activity that could lead to pregnancy from at least 21 days prior to enrollment until after the last required protocol clinic visit. Effective contraception is defined as using the following methods:  Condoms (male or female) with or without a spermicide, Diaphragm or cervical cap with spermicide, Intrauterine device (IUD), Hormonal contraception, or Any other contraceptive method approved by the PSRT Successful vasectomy in the male partner (considered successful if a volunteer reports that a male partner has [1] documentation of azoospermia by microscopy, or [2] a vasectomy more than 2 years ago with no resultant pregnancy despite sexual activity post vasectomy); Or not be of reproductive potential, such as having reached menopause (no menses for 1 year) or having undergone hysterectomy, bilateral oophorectomy, or tubal ligation; Or be sexually abstinent. Volunteers who were born female must also agree not to seek pregnancy through alternative methods, such as artificial insemination or in vitro fertilization until after the last required protocol clinic visit  Exclusion Criteria:  Blood products received within 120 days before first vaccination Investigational research agents received within 30 days before first vaccination Body mass index (BMI) ≥ 40; or BMI ≥ 35 with 2 or more of the following: age > 45, systolic blood pressure > 140 mm Hg, diastolic blood pressure > 90 mm Hg, current smoker, known hyperlipidemia Intent to participate in another study of an investigational research agent or any other study that requires non-HVTN HIV antibody testing Pregnant or breastfeeding Active duty and reserve US military personnel Vaccines and other Injections HIV vaccine(s) received in a prior HIV vaccine trial. Non-HIV experimental vaccine(s) received within the last 5 years in a prior vaccine trial, unless the vaccine subsequently received regulatory approval or emergency authorization. Live attenuated vaccines, other than influenza vaccine, received within 30 days before first vaccination or scheduled within 14 days after injection (eg, measles, mumps, and rubella [MMR]; oral polio vaccine [OPV]; varicella; yellow fever) Any vaccines that are not live attenuated vaccines and were received within 14 days prior to first vaccination (eg, tetanus, pneumococcal, Hepatitis A or B) Allergy treatment with antigen injections within 30 days before first vaccination or that are scheduled within 14 days after first vaccination Immune System Immunosuppressive medications received within 168 days before first vaccination (Not exclusionary: [1] corticosteroid nasal spray; [2] inhaled corticosteroids; [3] topical immunosuppressives; or [4] a single course of oral/parenteral prednisone or equivalent at doses < 60 mg/day and length of therapy < 11 days with completion at least 30 days prior to enrollment.) Serious adverse reactions to vaccines or to vaccine components including history of anaphylaxis and related symptoms such as hives, respiratory difficulty, angioedema, and/or abdominal pain. (Not excluded from participation: a volunteer who had a nonanaphylactic adverse reaction to pertussis vaccine as a child.) Immunoglobulin received within 60 days before first vaccination Autoimmune disease, connective tissue disease, or history of vasculitis, eg, leukocytoclastic vasculitis, Henoch-Schonlein Purpura Immunodeficiency Clinically significant medical conditions Untreated or incompletely treated syphilis infection  Clinically significant medical condition, physical examination findings, clinically significant abnormal laboratory results, or past medical history with clinically significant implications for current health. A clinically significant condition or process includes but is not limited to:  A process that would affect the immune response, A process that would require medication that affects the immune response, Any contraindication to repeated injections or blood draws, A condition that requires active medical intervention or monitoring to avert grave danger to the volunteer's health or well-being during the study period, A condition or process for which signs or symptoms could be confused with reactions to vaccine, or Any condition specifically listed among the exclusion criteria below. Any medical, psychiatric, occupational, or other condition that, in the judgment of the investigator, would interfere with, or serve as a contraindication to, protocol adherence, assessment of safety or reactogenicity, or a volunteer's ability to give informed consent Psychiatric condition that precludes compliance with the protocol. Specifically excluded are persons with psychoses within the past 3 years, ongoing risk for suicide, or history of suicide attempt or gesture within the past 3 years. Current anti-tuberculosis (TB) prophylaxis or therapy  Asthma exclusion criteria:  Asthma other than mild, well-controlled asthma.  Exclude a volunteer who:  Uses a short-acting rescue inhaler (typically a beta 2 agonist) daily, or In the past year has either of the following: Greater than 1 exacerbation of symptoms treated with oral/ parenteral corticosteroids; Needed emergency care, urgent care, hospitalization, or intubation for asthma Diabetes mellitus type 1 or type 2, including cases controlled with diet alone. (Not excluded: history of isolated gestational diabetes.) Thyroidectomy, or thyroid disease requiring medication during the last 12 months  Hypertension:  If a person has been found to have elevated blood pressure or hypertension during screening or previously, exclude for blood pressure that is not well controlled. Well-controlled blood pressure is defined as consistently ≤ 140 mm Hg systolic and ≤ 90 mm Hg diastolic, with or without medication, with only isolated, brief instances of higher readings, which must be ≤ 150 mm Hg systolic and ≤ 100 mm Hg diastolic. For these volunteers, blood pressure must be ≤ 140 mm Hg systolic and ≤ 90 mm Hg diastolic at enrollment. If a person has NOT been found to have elevated blood pressure or hypertension during screening or previously, exclude for systolic blood pressure ≥ 150 mm Hg at enrollment or diastolic blood pressure ≥ 100 mm Hg at enrollment. Bleeding disorder diagnosed by a doctor (eg, factor deficiency, coagulopathy, or platelet disorder requiring special precautions) Malignancy (Not excluded from participation: Volunteer who has had malignancy excised surgically and who, in the investigator's estimation, has a reasonable assurance of sustained cure, or who is unlikely to experience recurrence of malignancy during the period of the study) Seizure disorder: History of seizure(s) within past three years. Also exclude if volunteer has used medications in order to prevent or treat seizure(s) at any time within the past 3 years. Asplenia: any condition resulting in the absence of a functional spleen History of hereditary angioedema, acquired angioedema, or idiopathic angioedema.