PROFECTIO is an uncommon type that refers to "departure" for war.

Severus Alexander, 222-235. Sestertius.
Departing in 231 for a Persian war.
Sestertius. 30 mm. 21.68 g. Lovely green patina.
IMP SEVERVS ALEXANDER AVG
PROFECTIO AVGVS-TI
Emperor with spear on horseback right, led by Victory bearing wreath. SC below. RIC 596. Sear II 8012.
The symbolism of the reverse is clear. The emperor is going off to war, led by Victory.
In 227 the Parthians were overthrown by Ardeshir, the first Sasanian King. In 230 he invaded Roman territory across the Euphrates river. Attempts to negotiate peace failed and Rome went to war (see this type). In 232 some Roman territory was regained and although not decisive, a victory could be claimed.
I just posted a web site on PROFECTIO coins.
http://augustuscoins.com/ed/PROFECTIO/Near the end it discusses other coins related to travel. I wonder if you can think of other Roman types associated with travel? (Let's avoid Hadrian's well-known "travel series.") Can you show us other (not Hadrian) travel types?