Are you an engineer now?
What degree? What do you like doing? (Mechanical? Structural? Thermo and fluids? Power plant ops or simple mechanical component design?
What jobs did you do before now (work or school or whatever) and what did enjoy doing (during summer school or in previous jobs?
My answers (on which service and what fields in what service) will depend on what your answers are. 8<) I've known (family members) engineers in the USAF in aircraft maintenance and repair, USAF computers/radars/air plane planning, flight control/weather control, USN reactor operations, USN ship construction and conversion and repair, Army missile design and testing, USN field and base construction and design as SeaBee engineers - NOT the "Army destruction and blow-up" jobs mentioned above! .... Also regular USN engineers working as ship officers running gas turbine maintenance and operation, nuclear operations, and electronics and ship maintenance.
For my brother - who signed in after his BS degree, Officer Candidate school was 90 days, then you have a 4-5 year commitment to serve. For me, I had a 4-year scholarship then 1 year nuclear power school, then a 6 year service - but I added 5 more years running shipyard nuclear repairs. My college roommate took a 4 year BSCE then ran construction projects for the Navy for 5 years. My younger brother never flew with the USAF after his commision, but ran computer and electronics projects worldwide for 20 years, then "retired" at age 43. Etc.