Get something small that you will carry.
I'd say Spyderco Delica, Case Canoe.
I don't like SOG folders and I have a hard time recommending Kershaw though may folks love both of them.
841st Eng (Cbt/Hvy) 81ARCOM, 84th Eng (Cbt/Hvy) 2ACR, 40th Eng (Mech) 1AD, 588th Eng (Mech) 4ID
KM4HAG - HA
WQUZ848 - ZA