STEEL RAIN

Forward Observer · Call for Fire Trainer

A training and study aid for Army MOS 13F, USMC 0861, and equivalents. Bootcamp curriculum, procedural fire missions, OT-line corrections, voice STT with FDC readback. Built by an FO, for FOs.

Coming soon to App Store Coming soon to Google Play

What it does

Bootcamp · 5 classes

CFF format, mils & direction, map reading (TC 3-25.26 — full terrain feature curriculum, declination, resection, intersection), OT-line corrections with bracket-split logic, and a coached first live mission.

Fire Missions

Hand-authored scenarios plus a procedural mission generator that spins fresh terrain, target type, FO position, and weapon every time. Voice STT for the call-for-fire, FDC voice readback, MTO acknowledgement, OT-frame splash diagram with doctrinal corrections.

Six fire-support tools

9-Line CASEVAC (NATO + MIST-T), 9-Line CAS, 5-Line AAA / AWT Brief, MGRS converter, Fire Support Reference (FSCMs + munitions chart), Target List Worksheet (DA 4655 style).

Ranks & progression

XP advances you up the rank ladder, PV2 → PFC → SPC → SGT and beyond. Higher ranks unlock advanced tracks (immediate suppression, FPF, danger close). Tiered grading with EXPERT bonuses.

Doctrinal sources

Every lesson cites publicly-available unclassified Army and joint doctrine. No classified material, no operational data, no live ballistic tables. The values taught are training-grade approximations for instruction.

FM 3-09 — Fire Support
ATP 3-09.30 — Techniques for Observed Fire
TC 3-09.81 — Field Artillery Manual Cannon Gunnery
ATP 3-09.32 — JFIRE
TC 3-25.26 — Map Reading and Land Navigation
FM 670-1 — Wear and Appearance of Army Uniforms
FM 3-04.111 — Army Aviation Tactical Employment
JP 3-09 — Joint Fire Support
MCRP 3-31.6 — Marine Corps Supporting Arms Observer
CALL Handbooks — observer-fires lessons learned

Not for operational use

Steel Rain is a training aid. Effects-radius and dispersion values are unclassified approximations for instruction, not the firing data your unit's FDC uses. Do not transmit values from this app to a real Fire Direction Center.